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Forces
Revision of Forces chapter
Question | Answer |
---|---|
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 |