Physics 2 A Lesson 7A Equal and opposite reactions AQA Additional Science.
13
LO’s • Recall terms action & reaction • Recall unit of force © V Majer 2_1 Forces between objects March 16, 2022 Velocity distance Speed Accelerati on time m m/s m/s 2 s m/s Match the quantities with their units.
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Transcript of Physics 2 A Lesson 7A Equal and opposite reactions AQA Additional Science.
LO’s• Recall terms action & reaction• Recall unit of force
© V Majer
2_1 Forces between objectsApril 19, 2023
VelocitydistanceSpeedAccelerationtime
mm/sm/s2
sm/s
Match the quantities with their units.
LO’s• Recall terms action & reaction• Recall unit of force
2_1 Forces between objectsApril 19, 2023
VelocitydistanceSpeedAccelerationtime
m/smm/sm/s2
s
Match the quantities with their units.
Isaac Newton explained how forces work. His name is remembered as the unit of
force.
What is a force?• A push or a pull• May be unbalanced or balanced
What does a force do?
• Gives energy to an object
• Can set an object in motion, make it stop, or change its motion
Unbalanced forces change motion
• A Newton-meter measures forces.• Use the equipment to find the connection.
Weight and massForces are measured in Newtons
Mass (g) Weight (N) Weight (N)mass
0
50
100
150
200
What does this
column tell you
about the connection
?
Be careful of any zero error
– meter does not read zero with
no force.
What would a graph of mass vs weight look like?
“For every action, there is an equal and opposite reaction.”
Newton’s Third Law
Or – Why would I get wet if I tried this?
For every action, there is an equal and opposite reaction
The gases being expelledis the action. The rocket propelling forward is the reaction.
•
What have I learnt?
• The force on a ladder resting against a wall is …………….. and …………………to the force of the wall on the ladder
• A book is at rest on a table. The force of the book on the table …………..
The force of the table on the book is ……………….
Copy and complete m3
equal opposite
downwards
upwards
Use these words; Downwards equal opposite upwards
Forces are represented by vectors (size and direction)
Copy
All
Know that whenever 2 objects push or pull on each other they exert equal and opposite forces on each other
Recall unit of force
Most
Be able to draw diagrams to demonstrate forces acting
Be able to explain resultant force
Some Be able to explain how friction makes a car move.
Aims
The End
