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13 Cards in this Set
- Front
- Back
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Whenever 'work' is done energy is:
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transferred from one place to another.
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What is the equation for work done?
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Work done = force x distance.
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What is power a measure of?
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How quickly work is being done and so how quickly energy is being transferred.
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What's the equation for power?
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Power = work done / time taken.
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Both energy and work are measured in:
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joules, J.
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The amount of work done depends on:
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>The size of the force on the object>The distance the object moves
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How much work is done when a man lifts a box weighing 200N off the floor to a shelf 2m high?
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Work done = force x distance = 200N x 2m = 400J
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What is the power of an engine that does 3000J of work in 60s?
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Power = work done / time taken Power = 3000J/60s = 50W |
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How far will a car with a fuel consumption of 7 litres/100km go on 14 litres of fuel? |
200km
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How much work is done by a person who lifts a box of weight 250N up a height of 2m?
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500 J
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What force is needed to do 500J of work over a distance of 5m? |
100N
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What is the power output of a machine when it produces a force of 100N which moves an object through 4m in 20s?
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20 W
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How much work can a 500W machine do in 1 minute?
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30,000J
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