GPE and KE - WordPress.com · 2016. 5. 19. · greater its GPE. The larger the distance something...
Transcript of GPE and KE - WordPress.com · 2016. 5. 19. · greater its GPE. The larger the distance something...
GPE and KE
How can we calculate energy
08012016 copy cgrahamphysicscom 2016
Starter Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
GPE LO State the GPE depends on mass and height above ground Calculate changes in GPE
08012016 copy cgrahamphysicscom 2016
bull When you lift an object up energy is transferred from your muscles in to gravitational potential energy of the object
Gravitational potential energy (GPE) is energy stored in an object because of its position in the earths gravitational field
08012016 copy cgrahamphysicscom 2016
bull Which books have GPE
bull Which book has the most GPE
bull Which book has the least GPE
08012016 copy cgrahamphysicscom 2016
bull What would happen to the GPE of book C if you moved it to the higher shelf
bull What would
happen to the GPE of book B if you moved it to the lower shelf
08012016 copy cgrahamphysicscom 2016
bull If both flower pots were to fall out the window which one is more likely to break Why
08012016 copy cgrahamphysicscom 2016
The higher up an object is the greater its GPE The larger the distance something falls through the greater the amount of GPE the object loses as it falls As most of this GPE gets changed into kinetic energy the higher up the object starts from the faster it will be falling when it hits the ground So a change in gravitational potential energy depends on the height an object moves through
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
Well the tree has more mass Therefore it would need more GPE to reach the same height So a change in gravitational potential energy also depends on the mass of the object that is changing height
08012016 copy cgrahamphysicscom 2016
Put the pictures in order starting with the one with the most GPE
08012016 copy cgrahamphysicscom 2016
bull To move book C work must be done (We need to put a force in to move it) Work done depends on
-- how far the object is moved
-- and how much it weighs 08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Starter Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
GPE LO State the GPE depends on mass and height above ground Calculate changes in GPE
08012016 copy cgrahamphysicscom 2016
bull When you lift an object up energy is transferred from your muscles in to gravitational potential energy of the object
Gravitational potential energy (GPE) is energy stored in an object because of its position in the earths gravitational field
08012016 copy cgrahamphysicscom 2016
bull Which books have GPE
bull Which book has the most GPE
bull Which book has the least GPE
08012016 copy cgrahamphysicscom 2016
bull What would happen to the GPE of book C if you moved it to the higher shelf
bull What would
happen to the GPE of book B if you moved it to the lower shelf
08012016 copy cgrahamphysicscom 2016
bull If both flower pots were to fall out the window which one is more likely to break Why
08012016 copy cgrahamphysicscom 2016
The higher up an object is the greater its GPE The larger the distance something falls through the greater the amount of GPE the object loses as it falls As most of this GPE gets changed into kinetic energy the higher up the object starts from the faster it will be falling when it hits the ground So a change in gravitational potential energy depends on the height an object moves through
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
Well the tree has more mass Therefore it would need more GPE to reach the same height So a change in gravitational potential energy also depends on the mass of the object that is changing height
08012016 copy cgrahamphysicscom 2016
Put the pictures in order starting with the one with the most GPE
08012016 copy cgrahamphysicscom 2016
bull To move book C work must be done (We need to put a force in to move it) Work done depends on
-- how far the object is moved
-- and how much it weighs 08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
GPE LO State the GPE depends on mass and height above ground Calculate changes in GPE
08012016 copy cgrahamphysicscom 2016
bull When you lift an object up energy is transferred from your muscles in to gravitational potential energy of the object
Gravitational potential energy (GPE) is energy stored in an object because of its position in the earths gravitational field
08012016 copy cgrahamphysicscom 2016
bull Which books have GPE
bull Which book has the most GPE
bull Which book has the least GPE
08012016 copy cgrahamphysicscom 2016
bull What would happen to the GPE of book C if you moved it to the higher shelf
bull What would
happen to the GPE of book B if you moved it to the lower shelf
08012016 copy cgrahamphysicscom 2016
bull If both flower pots were to fall out the window which one is more likely to break Why
08012016 copy cgrahamphysicscom 2016
The higher up an object is the greater its GPE The larger the distance something falls through the greater the amount of GPE the object loses as it falls As most of this GPE gets changed into kinetic energy the higher up the object starts from the faster it will be falling when it hits the ground So a change in gravitational potential energy depends on the height an object moves through
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
Well the tree has more mass Therefore it would need more GPE to reach the same height So a change in gravitational potential energy also depends on the mass of the object that is changing height
08012016 copy cgrahamphysicscom 2016
Put the pictures in order starting with the one with the most GPE
08012016 copy cgrahamphysicscom 2016
bull To move book C work must be done (We need to put a force in to move it) Work done depends on
-- how far the object is moved
-- and how much it weighs 08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull When you lift an object up energy is transferred from your muscles in to gravitational potential energy of the object
Gravitational potential energy (GPE) is energy stored in an object because of its position in the earths gravitational field
08012016 copy cgrahamphysicscom 2016
bull Which books have GPE
bull Which book has the most GPE
bull Which book has the least GPE
08012016 copy cgrahamphysicscom 2016
bull What would happen to the GPE of book C if you moved it to the higher shelf
bull What would
happen to the GPE of book B if you moved it to the lower shelf
08012016 copy cgrahamphysicscom 2016
bull If both flower pots were to fall out the window which one is more likely to break Why
08012016 copy cgrahamphysicscom 2016
The higher up an object is the greater its GPE The larger the distance something falls through the greater the amount of GPE the object loses as it falls As most of this GPE gets changed into kinetic energy the higher up the object starts from the faster it will be falling when it hits the ground So a change in gravitational potential energy depends on the height an object moves through
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
Well the tree has more mass Therefore it would need more GPE to reach the same height So a change in gravitational potential energy also depends on the mass of the object that is changing height
08012016 copy cgrahamphysicscom 2016
Put the pictures in order starting with the one with the most GPE
08012016 copy cgrahamphysicscom 2016
bull To move book C work must be done (We need to put a force in to move it) Work done depends on
-- how far the object is moved
-- and how much it weighs 08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull Which books have GPE
bull Which book has the most GPE
bull Which book has the least GPE
08012016 copy cgrahamphysicscom 2016
bull What would happen to the GPE of book C if you moved it to the higher shelf
bull What would
happen to the GPE of book B if you moved it to the lower shelf
08012016 copy cgrahamphysicscom 2016
bull If both flower pots were to fall out the window which one is more likely to break Why
08012016 copy cgrahamphysicscom 2016
The higher up an object is the greater its GPE The larger the distance something falls through the greater the amount of GPE the object loses as it falls As most of this GPE gets changed into kinetic energy the higher up the object starts from the faster it will be falling when it hits the ground So a change in gravitational potential energy depends on the height an object moves through
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
Well the tree has more mass Therefore it would need more GPE to reach the same height So a change in gravitational potential energy also depends on the mass of the object that is changing height
08012016 copy cgrahamphysicscom 2016
Put the pictures in order starting with the one with the most GPE
08012016 copy cgrahamphysicscom 2016
bull To move book C work must be done (We need to put a force in to move it) Work done depends on
-- how far the object is moved
-- and how much it weighs 08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull What would happen to the GPE of book C if you moved it to the higher shelf
bull What would
happen to the GPE of book B if you moved it to the lower shelf
08012016 copy cgrahamphysicscom 2016
bull If both flower pots were to fall out the window which one is more likely to break Why
08012016 copy cgrahamphysicscom 2016
The higher up an object is the greater its GPE The larger the distance something falls through the greater the amount of GPE the object loses as it falls As most of this GPE gets changed into kinetic energy the higher up the object starts from the faster it will be falling when it hits the ground So a change in gravitational potential energy depends on the height an object moves through
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
Well the tree has more mass Therefore it would need more GPE to reach the same height So a change in gravitational potential energy also depends on the mass of the object that is changing height
08012016 copy cgrahamphysicscom 2016
Put the pictures in order starting with the one with the most GPE
08012016 copy cgrahamphysicscom 2016
bull To move book C work must be done (We need to put a force in to move it) Work done depends on
-- how far the object is moved
-- and how much it weighs 08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull If both flower pots were to fall out the window which one is more likely to break Why
08012016 copy cgrahamphysicscom 2016
The higher up an object is the greater its GPE The larger the distance something falls through the greater the amount of GPE the object loses as it falls As most of this GPE gets changed into kinetic energy the higher up the object starts from the faster it will be falling when it hits the ground So a change in gravitational potential energy depends on the height an object moves through
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
Well the tree has more mass Therefore it would need more GPE to reach the same height So a change in gravitational potential energy also depends on the mass of the object that is changing height
08012016 copy cgrahamphysicscom 2016
Put the pictures in order starting with the one with the most GPE
08012016 copy cgrahamphysicscom 2016
bull To move book C work must be done (We need to put a force in to move it) Work done depends on
-- how far the object is moved
-- and how much it weighs 08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
The higher up an object is the greater its GPE The larger the distance something falls through the greater the amount of GPE the object loses as it falls As most of this GPE gets changed into kinetic energy the higher up the object starts from the faster it will be falling when it hits the ground So a change in gravitational potential energy depends on the height an object moves through
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
Well the tree has more mass Therefore it would need more GPE to reach the same height So a change in gravitational potential energy also depends on the mass of the object that is changing height
08012016 copy cgrahamphysicscom 2016
Put the pictures in order starting with the one with the most GPE
08012016 copy cgrahamphysicscom 2016
bull To move book C work must be done (We need to put a force in to move it) Work done depends on
-- how far the object is moved
-- and how much it weighs 08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
Well the tree has more mass Therefore it would need more GPE to reach the same height So a change in gravitational potential energy also depends on the mass of the object that is changing height
08012016 copy cgrahamphysicscom 2016
Put the pictures in order starting with the one with the most GPE
08012016 copy cgrahamphysicscom 2016
bull To move book C work must be done (We need to put a force in to move it) Work done depends on
-- how far the object is moved
-- and how much it weighs 08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
To lift an apple 1m would be easier than to life the apple tree 1m Why
Well the tree has more mass Therefore it would need more GPE to reach the same height So a change in gravitational potential energy also depends on the mass of the object that is changing height
08012016 copy cgrahamphysicscom 2016
Put the pictures in order starting with the one with the most GPE
08012016 copy cgrahamphysicscom 2016
bull To move book C work must be done (We need to put a force in to move it) Work done depends on
-- how far the object is moved
-- and how much it weighs 08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Put the pictures in order starting with the one with the most GPE
08012016 copy cgrahamphysicscom 2016
bull To move book C work must be done (We need to put a force in to move it) Work done depends on
-- how far the object is moved
-- and how much it weighs 08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull To move book C work must be done (We need to put a force in to move it) Work done depends on
-- how far the object is moved
-- and how much it weighs 08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
What do you think GPE would depend on
bull The amount of gravitational potential energy an object on Earth has depends on its
bull Mass
bull Height above the ground
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull So change in GPE =
bull mass x change in height x gravitational field strength
bull What are the units
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull So change in GPE (joules)
bull mass (kg)
bull change in height (m)
bull gravitational field strength (m1199042)
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull Calculate change in GPE when a 1000kg aeroplane takes off up to a height of 500m
So change in GPE = mass x change in height x gravitational field strength
Gravitational field strength on earth= 10NKg =1000kg x 500m x 10Nkg =5000000j
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Gravitational potential energy
Ep = mgh
J kg
Nkg or ms2
m
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Example
A dog of mass 12 kg falls from an aeroplane at a height of 34 km How much gravitational energy does the dog have as it leaves the aeroplane
Woof
(help)
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Example
On earth g = 10 ms2
Height = 34 km = 3400 m
Mass of dog = 12 kg
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Example
GPE of dog = mgh = 12 x 10 x 3400 = 408 000 J
Just before the dog hits the ground what has this GPE turned
into
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Kinetic energy
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Where is this useful bull Many theme park rides use the transfer of
gravitational potential energy to kinetic energy and kinetic energy to gravitational potential energy
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
GPE increases
GPE decreases
Kinetic energy increases
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Energy Transfer
bull Schiffschaukel - YouTube [720p]mp4
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Plenary GPE calculations
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY Second Part Lesson 5
LO
Explain what kinetic energy of an object depends on (C)
Calculate kinetic energy (B)
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Who has the most kinetic energy Rita or the cat Write down how you know
Feeling energetic
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull Any ideas
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy tells us how much movement energy something has
bull It doesnt just depend on how fast something is moving it also depends on mass
bull If a car and a lorry are both travelling at the same speed the lorry will do much more damage if it hits something than if the car does
bull The lorry has more kinetic energy even though they are both travelling at the same speed 08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy is energy an object has due to motion It depends on two things
bull The objects mass
bull The objects speed
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull Kinetic energy = frac12 x mass x speed2
bull Units of KE= joules
bull Mass= kg
bull Speed= ms
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull A car with a mass of 500 kg is moving at a speed of 12 ms How much kinetic energy does it have
bull frac12 x 500 x (122) = 36000 J
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object
KE = frac12mv2
What are the rearranged versions of this equation for calculating mass and velocity
m = 2KE
v2 v =
2KE m
Rearranging the KE equation
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
A lorry has a mass of 20000 kg If its kinetic energy is 225 mJ at what velocity is it travelling
Calculating velocity question
KE = frac12 x mass x velocity2
= 15 ms
velocity = 2KE mass
= 2 x 2250000
20000
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull Assuming that all the gravitational potential energy of a falling object is transferred to kinetic energy
bull GPE = KE
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
GPE = KE
Mass x gravitational field strength x height
frac12 x Mass x speed2
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
GPE = KE
gravitational field strength x height
frac12 x speed2
G x H = frac12 V2 08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
G x H = frac12 V2
Can be rearranged
h = v2
2g
For example how high must an object be dropped so that is reaches 30 ms (g = 10 Nkg)
height = 302
2 times 10
= 90020
= 45 m
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
KE mass and velocity calculations
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
bull An object is elastic if- it regains its shape after being stretched or squashed
Elastic potential energy is stored in the object that is being stretched or squashed What can this be transferred in to
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
KINETIC ENERGY 08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
conservation of energy ndash The law that states that energy cannot
be created or destroyed just transferred into different forms
energy transfer ndash A process in which one form of energy is transferred
into another form
gravitational field strength ndash The strength of gravity in a
particular location
gravitational potential ndash The energy an object has because of its
position in a gravitational field
joule ndash The unit of energy
kinetic ndash The energy an object has because it is moving
velocity ndash A measure of the speed and direction of a moving object
Glossary
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Plenary Anagrams
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016
Multiple-choice quiz
08012016 copy cgrahamphysicscom 2016