# Work, Power and Energy

What does Work Done mean ?
Work Done is there force causing motion x the distance moved.
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What is the work done against when lifting a box ?
Gravitational Potential energy.
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What is the final energy form after stretching a spring ?
Elastic Potential energy.
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What is the unit for work done ?
Measured in Joules.
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Is work in all cases the total energy ?
No work done isn't always the total energy.
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What is the definition of a Joule ?
One Joule is the work done when a force of 1 Newton moves an object through a distance of 1 metre.
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What is the definition of Power ?
The rate of doing work
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What is the definition of the Watt ?
The rate of energy transferred equal to 1 Joule per second
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What is Power measured in ?
Watts/W
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What is Kinetic Energy ?
The energy an object has due to its movement.
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What is the equation for Kinetic Energy ?
1/2 m v^2
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What is Gravitational Potential Energy ?
Is the energy an object has due to its position in a gravitational field.
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What is the equation for Gravitational Potential Energy ?
mgh
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What is the Principle of conservation of energy ?
Energy cannot be created or destroyed. Energy can be transferred from one form to another but the total amount of energy in a closed system will not change.
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Name the main way energy is lost in a system ?
Heat energy
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What is the simple energy rule in a ideal system ?
Total energy in = Total energy out
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What is Efficiency ?
Efficiency is the ratio of useful energy output to Total Energy Input.
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## Other cards in this set

### Card 2

#### Front

What is the work done against when lifting a box ?

#### Back

Gravitational Potential energy.

### Card 3

#### Front

What is the final energy form after stretching a spring ?

#### Back ### Card 4

#### Front

What is the unit for work done ?

#### Back ### Card 5

#### Front

Is work in all cases the total energy ?

#### Back ## Comments

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