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# Forces

### Revision of Forces chapter

What is a force? Something which causes an object to change its speed or accelerate.
What units are forces measured in? Newtons
List some examples of forces. Electrical, magnetic, push, pull, friction, gravity, tension, stretching, twisting, compression
What is friction? A force that opposes motion between two bodies in contact with one another.
Give two advantages of friction. Warm hands on a cold morning, allows tyres to grip the road.
Give two disadvantages of friction. Wear and tear of machinery parts, causes the wear of car and bike tyres
List one way of reducing friction. Lubrication
What is Hooke's Law? The extension in a spring is directly proportional to the force causing the extension.
Describe the graph you would get when verifying Hooke's Law. Straight line graph through the origin
What is work? When a force moves an object by a certain distance, work is done. (W = F.d)
What are the units of work? Joules
Created by: joeykenn

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