Physics Unit 3.2 Moments

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What is a moment?
A moment is a force that causes turning around a point, or fulcrum.
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What can moments be used to do?
Create an apparently larger turning force by increasing the perpendicular distance between the effort and the fulcrum. What is actually happening is a larger moment is created from the same effort.
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When the force is applied at an angle, other than right angles to the distance of the point, the effort is lessened.
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If an object is not turning, what is the moment?
The total clockwise moment must be exactly balanced by the total anticlockwise moment about any pivot.
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What is a lever often referred as?
Force mutliplyer.
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Describe levers, and use examples.
A lever is a simple machine that makes work easier to do. Examples of simple levers include cutting with scissors, or lifting the lid on a tin of paint with a screwdriver. Levers reduce the force needed to perform these tasks.
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Describe what happens when someone uses a lever.
When someone uses a lever, they exert a force (the effort) around a pivot to move an object (the load).
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Levers rely on the principle of moments to act as ‘force multipliers’ - they reduce the effort needed to move the load by increasing the distance over which it is acting. This means a relatively small effort force has a much greater effect.
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What happens if the line of action lies outside the object?
There will be a resultant moment and the body will tend to topple. anti-clockwise moment is greater than the clockwise moment and the object topples over.
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Other cards in this set

Card 2

Front

What can moments be used to do?

Back

Create an apparently larger turning force by increasing the perpendicular distance between the effort and the fulcrum. What is actually happening is a larger moment is created from the same effort.

Card 3

Front

When the force is applied at an angle, other than right angles to the distance of the point, the effort is lessened.

Back

Preview of the front of card 3

Card 4

Front

If an object is not turning, what is the moment?

Back

Preview of the front of card 4

Card 5

Front

What is a lever often referred as?

Back

Preview of the front of card 5
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