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25 Cards in this Set
- Front
- Back
- 3rd side (hint)
What is energy |
Energy is the ability to do work |
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When is work done |
Work is done when energy is changed |
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When is energy used |
Used when a force is applied |
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When is work done |
Work is done whenever a force moves something |
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How do u calculate work |
W= force × distance |
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What is the work done and energy transferred measured in |
It is measured in joules |
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What does the amount of work depend on |
The amount of work done depends on the size of the force and the distance an object moves |
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What is power |
Power is a measure of how quickly work is being done |
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What do objects gain when their lifted up |
They gain gravitational energy |
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What do moving objects have |
They have kinetic energy |
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Give examples of work |
Walking up stairs, lifting heavy objects |
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What happens to energy when work is done |
It is transferred from one place yo another, from one form to another |
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What does W stand for in an equation |
W= work done in joules |
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Define F |
F=is the force applied in newtons,N |
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Define D |
D=is the distance moved in the direction of the force in metres, m |
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Example...W=F×D |
W= 10×2m = 20J |
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How many Newtons are in 1kg |
1kg=10N |
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What is power |
Power is the rate of doing work |
What rate is it |
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Power is the amount of work done(at what rate) |
It is work done per second |
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How do u calculate power |
P= work done÷time taken |
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What is the unit for power |
Measured in watts(W) |
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Define the following Energy Forcemeter Joule Power Watt Work |
Energy - the ability to do work Forcemeter - an instrument Joule - the unit of power Power - the rate of doing work Watt - the unit of power Work - that which is doing when force moves a load |
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What is a machine |
A machine is any device for doing work |
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What is the use of machines |
Machonesreduce he force neede to work. They make work easier |
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What does it allow to happen with forces |
It helps a small force to overcome a large force |
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