1. What happens? When two objects interact (push or pull),
P Forces Between objects
When two objects interact (push or pull),
they exert equal and opposite
forces on each other.
10N
10N
What
happens?

2. What happens? When two objects interact (push or pull),
P Forces Between objects
The skaters move
towards each other
When two objects interact (push or pull),
they exert equal and opposite
forces on each other.
10N
10N
What
happens?

3. F c P2 2.1 Forces Between objects At any stage this is true Ft
But to pull the car out of the mud
Ft > F c

4. What happens if a car accelerates while its wheels are on carpet mats?
there isn’t
enough friction ?
Friction acts where the tyre
is in contact with the road.
(even when accelerating or braking)
Wheel slides
What happens if a car accelerates while its wheels are on carpet mats?
Carpet mats move backwards, car moves forwards (a little)

5. Trolley pulled along a flat runway
(Not showing vertical forces)
Pull on the trolley
Pull on the person pulling
Friction on the runway
Friction on the trolley
5 N
5 N
1 Kg Ft Fr Ft Fr
What would happen if the trolley got stuck on the runway?
You pull the runway along too!

6. A floating ball D C B A Equal and opposite forces:
* act on different objects
* act in opposite directions
* are the same type of force
* act along the same line D C
B - weight (force of gravity on the ball)
A - gravitational pull of ball on the earth B
C - contact force of water on ball (Upthrust)
A - contact force of ball on the water A

7. A floating ball Paper clips held by a magnet D C N S H G B A F E
Equal and opposite forces:
* act on different objects
* act in opposite directions
* are the same type of force
* act along the same line A F E

8. A book at rest
A stretched spring P Q R S U V X Y