I can define energy and can tell the difference between ... - D… · I can define energy and can...

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1 Yesterday’s Learning Goal: I can define energy and can tell the difference between work and power . Energy is the mover and changer of the matter Work is the amount of force needed to move an object a certain distance Power is the rate at which work is done

Transcript of I can define energy and can tell the difference between ... - D… · I can define energy and can...

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Yesterday’s Learning Goal:

I can define energy and can tell the difference between work and power.

Energy is the mover and changer of the matterWork is the amount of force needed to move an object a certain distancePower is the rate at which work is done

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Homework Review

• Work is a measure of energy

• Work is only done when an object is moving

• Work is a vector which means it has an amount and a direction

• Negative work means the object is moving backwards or the force is pushing back

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Homework Review

Units:

Work is Joules (J)

Power is Watts (W)

Formulas:

Work = force x distance

Power = work / time

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Today’s Learning Goal

I can explain the relationship between potential energyand kinetic energy.

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Energy

A

B

What is different about the “energy” between A and B?

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Types of Energy

Potential Energy(PE)

“Stored” energy because of position, shape or state

Potential to do work

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Potential Energy

Examples:

Drawn bow

Energy in food

Water at the top of the waterfall

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Types of Potential Energy

The water at the top of thewaterfall is an example ofGravitational PE

The energy stored in food is an example of Chemical PE

The energy is a compressed spring is Elastic PE

Other types: Electromagnetic and Nuclear

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Calculating Gravitational PE

Work = Force x Distance

For P.E.

Force = Force due to gravity (Weight)

= Mass x 10 (N/km)

Distance = Height

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Potential Energy Example

Which has more Potential Energy?

A B C

3 m

Each ball weighs 10 N

PE (work) is the same for all 3 3 m x 10 N = 30 J

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CHECK YOUR NEIGHBOR

Does a car hoisted for an oil change in a service station have PE?

How much work will raise the car twice as high? Three times as high?

How much more PE will it have in these cases?

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CHECK YOURSELF

Suppose you were to drop a bowling ball on your toe—first from a distance of 1 mm above your toe.

How would that feel?

What about 1 meters?

What about 5 meters?

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CHECK YOURSELF

Each time, the bowling ball would do more work on your toe, because it would have more gravitational potential energy when released.

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Learning Goal Check

How do you feel about Potential Energy?

Could you explain Potential Energy to your friends or family?

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Potential and Kinetic Energy

� http://www.youtube.com/watch?v=BVxEEn3w688

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What is Kinetic Energy?

How much potential energy does A have?

What about B?

Does B have energy?

A

B

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Kinetic Energy

Kinetic Energy (KE) is the energy associated with a moving object

A

B

D

C

A = all PE B =all KE C=PE & KE D=all PE

An object can have PE & KE!

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Kinetic Energy

Energy can be transferred from one object to another.

Energy can change from between PE and KE.

KE to PEPE to KE

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Calculating Kinetic Energy

The KE of an object depends on its mass and speed

KE = ½ mass x speed2 = 1/2mv2

Note: KE is also a measure of work so the unit is Joules!

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Kinetic Energy Example

A car moving along a road has kinetic energy. How much more KE will a car that is twice as heavy have?

Car 1 Mass = 100 kgSpeed = 10 m/s

KE = ½(100)(10)2

KE = 5000 J

Car 2 Mass = 200 kgSpeed = 10 m/s

KE = ½(200)(10)2

KE = 10000 J

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CHECK YOURSELF

When the brakes of a car are locked, the car skids to a stop. How much farther will the car skid if it’s moving 3 times as fast?

Car Slow Mass = 100 kgSpeed = 10 m/s

KE = ½(100)(10)2

KE = 5000 J

Car Fast Mass = 100 kgSpeed = 30 m/s

KE = ½(100)(30)2

KE = 45000 J

9 times the work = 9 times the distance!

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Formula Review

Velocity = distance / time

Force = mass x acceleration

Momentum = mass x velocity

Impulse = force x time

Work = force x distance

Power = work / time

PE = mass x 10 x height

KE = ½ mass x velocity2

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How are you feeling about this

concept?

� Reflection

How well do you understand energy?

Potential vs. Kinetic Energy?

What can you do to improve your understanding?


The Empirical Mode Decomposition Method Sifting. Goal of Data Analysis To define time scale or frequency. To define energy density. To define joint frequency-energy.

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Binding Energy Nuclear Physics Lesson 13. Learning Objectives To define binding energy. To define binding energy. To define mass defect. To define mass.

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© 2013 Pearson Education, Inc. Define kinetic energy as an energy of motion: Define gravitational potential energy as an energy of position: The sum K.

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Define Energy

Define Energy

ENERGY Essential Question: What is Energy? AIM: SWBAT define the word “energy” and describe examples of energy.

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Define ‘energy’, ‘work’, and ‘power’. Define ‘energy’, ‘work’, and ‘power’. Identify examples of potential, chemical and kinetic energy within the body.

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UNIT ENERGY PRINCIPLES 1. Define strain energy (A/M … · UNIT – ENERGY PRINCIPLES 1. Define strain energy ... stiffness coefficient method · Force method (compatibility method

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How can we define the Black Power Movement?

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Introductory Questions #6 1)Explain how potential energy is different from kinetic energy. What are some ways we can measure energy? 2) Define each variable.

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Define polarization in dielectric materials. Define dielectric strength of the insulating material. Name any two devices which converts light energy into electrical energy. (5 x 2

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