- Forces are measured in Newtons (N)
- Objects always exert equal and opposite forces on each other.
- If object A exerts a force on object B, oject B exerts an equal and opposite force on object A. These are sometimes called 'action and reaction' forces.
- A force can change the shape of an object or change its motion or state of rest.
Example:
When a car is being driven fowards there is a force from the tyre on the ground pushing backwards. There is an equal and opposite force from the ground on the tyre which pushes the car forwards.
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