Science - Force & Work
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What is force?
This is a push or pull that can change the speed, the direction or the shape of the body
List examples of force
State the unit used to measure force
What is gravity?
Gravity is the force that pulls things towards the earth
What is weight?
The weight of an object is the force of gravity acting on it
State the unit used to measure weight
What instrument is used to measure weight?
Explain what is meant by the term friction
Friction is the force that slows down moving things
Give examples of friction
Tyres use friction to grip the road
Brakes use friction to slow down cars
State a way to reduce friction
Give an advantage of friction
Friction slows things down eg. brakes on a car use friction to slow the wheels down
State a disadvantage of friction
Friction between surfaces can wear them away eg. it can wear brake pads down
Explain Hooke's Law
This states that the extension of a spring is directly proportional to the force that is stretching it
What is work?
Work is when a force makes something moves
State the unit used to measure work
What is power?
Power is how fast work is done
State the unit used to measure power
What would you like to do?
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