MYP Physics Topic Work and Power, Efficiency Revision…

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MYP Physics Topic Work and Power, Efficiency Revision… | RevisionDojo

How Does Work Link Forces To Energy Transfer

Definition

Work

Results from the application of force over distance. When work is

done, energy is transformed from one form to another.

In physics, work is not the same as effort or tiredness.
Work describes how energy is transferred when a force causes an object to move.
Work is only done when a force causes movement in the direction of that force.
If there is no movement, no work is done, even if a force is applied.

Calculating Work Done

The amount of work done depends on how large the force is.
It also depends on how far the object moves.
The distance considered is only the distance moved in the direction of the force.

$$W = Fd$$

where:

$W$ is work (joules, J)
$F$ is force (newtons, N)
$d$ is distance moved (metres, m)

Note

Work is measured in joules (J).

When Work Is Done

Work is done when a force causes movement in the same direction as the force.
Work is also done when movement is opposite to the force, such as lifting against gravity.
In these cases, energy is transferred into or out of the object.

Example

Lifting a bag onto a shelf transfers energy from your muscles to the bag.

When Work Is NOT Done

No work is done if an object does not move.
No work is done if the motion is at right angles to the force.
Even strong forces may transfer no energy if they do not cause movement.

Analogy

Think “WORK = MOVE”.
If there is no movement in the force’s direction, your brain should immediately think “no work”.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Note

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Tip

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
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MYP Physics Work and Power, Efficiency Notes

How Does Work Link Forces To Energy Transfer

Calculating Work Done

When Work Is Done

When Work Is NOT Done

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Excepteur sint occaecat cupidatat non proident

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How Does Work Link Forces To Energy Transfer

Calculating Work Done

When Work Is Done

When Work Is NOT Done

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Forces and energy8 subtopics

Heat, light and sound6 subtopics

Electromagnetism9 subtopics

Waves5 subtopics

Astrophysics3 subtopics

Atomic physics2 subtopics

MYP Physics Work and Power, Efficiency Notes

Forces and energy8 subtopics

Heat, light and sound6 subtopics

Electromagnetism9 subtopics

Waves5 subtopics

Astrophysics3 subtopics

Atomic physics2 subtopics

How Does Work Link Forces To Energy Transfer

Calculating Work Done

When Work Is Done

When Work Is NOT Done

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How Does Work Link Forces To Energy Transfer

Calculating Work Done

When Work Is Done

When Work Is NOT Done

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