ip2.1.5 what do forces do? © oxford university press 2011 what do forces do?

IP2.1.5 What do forces do? © Oxford University Press 2011 What do forces do?

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IP2.1.5 What do forces do?

What do forces do?

IP2.1.5 What do forces do?

A resultant force changes the way something moves.

If an object is not moving (stationary), then a resultant force makes it begin to move, and if it is already moving a resultant force changes the way it moves.

A resultant force makes an object accelerate. It makes it speed up, slow down or change direction.

IP2.1.5 What do forces do?

When this stationary snooker ball is struck by the moving cue ball it experiences a resultant force.

What happens to the ball?

It accelerates and moves in the direction of the resultant force.

IP2.1.5 What do forces do?

This satellite in orbit around Earth experiences a resultant force due to gravity. It has a constant speed as it orbits and it does not crash down to the surface.

What is the resultant force doing?

It is making the satellite accelerate; in this case it is changing the direction of the satellite’s motion.

IP2.1.5 What do forces do?

If there is NO resultant force acting on a body it does not accelerate.

This means it will continue travelling at the same speed in the same direction if it is moving or will remain stationary.

In deep space a moving object will continue moving at a constant speed in a straight line.

IP2.1.5 What do forces do?

Zero resultant force Resultant force

Stationary object

Moving object

Here is a summary of the effects of forces on objects.

Remains stationary Starts moving (accelerates)

Continues moving at a steady speed in a straight line

Accelerates in the direction of the resultant force (this might mean slowing down if the force is in the opposite direction to the motion of the object)

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