Physics P2 3.1 Energy and work.

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When is work done on an object?
When a force makes the object move.
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What does energy transferred equal?
Work done.
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What is work done to overcome friction transferred as?
Energy that heats the objects that rub together and the surroundings.
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What must have been applied whenever an object starts to move?
A force.
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What happens when a force moves an object?
Energy is transferred and work is done.
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How much energy is used when work is done moving an object?
When work is done moving an object, the supplied energy is transferred to the object so the work done is equal to the energy transferred.
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What unit applies to both work and energy?
Joule (J).
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What equation is used to calculate the work done on an object?
W = F x d.
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In the equation to calculate the work done on an object, what is W?
The work done in joules (J).
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In the equation to calculate the work done on an object, what is F?
The force in newtons (N).
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In the equation to calculate the work done on an object, what is d?
The distance moved in the direction of the force in metres (m).
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What is the distance moved if no work is done on an object?
Zero.
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What happens when the brakes are applied to a vehicle and what energy is used?
Friction between the brake pads and the wheel discs opposes the motion of the wheel, the kinetic energy of the vehicle is transferred into energy that heats the brake pads and the wheel discs as well as the surrounding air.
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What is the SI unit of work done?
Joules (J).
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What is the work done on an object if a force of 300 N moves it a distance of 8 m?
2400 J.
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Other cards in this set

Card 2

Front

What does energy transferred equal?

Back

Work done.

Card 3

Front

What is work done to overcome friction transferred as?

Back

Preview of the front of card 3

Card 4

Front

What must have been applied whenever an object starts to move?

Back

Preview of the front of card 4

Card 5

Front

What happens when a force moves an object?

Back

Preview of the front of card 5
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