P 2 2 1 Forces Between objects When

P 2 2. 1 Forces Between objects When two objects interact (push or pull), they exert equal and opposite forces on each other. 10 N What happens? 10 N

P 2 2. 1 Forces Between objects When two objects interact (push or pull), they exert equal and opposite forces on each other. 10 N What happens? The skaters move towards each other 10 N

P 2 2. 1 Forces Between objects At any stage this is true Ft Fc But to pull the car out of the mud Ft > F c

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

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 What would happen if the trolley got stuck on the runway? You pull the runway along too!

A floating ball D C Equal and opposite forces: * act on different objects * act in opposite directions * are the same type of force * act along the same line 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

A floating ball Paper clips held by a magnet D C N S 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 F E H G

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