What is a moment?

A moment is the turning effect of a force.

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What is the unit of a moment?

N m

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What is the equation that links moment, force (F) and distance from the pivot (d)?

moment = F x d


Moment (N m)

Force (N)

Distance (m)

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What is the principle of conservation of moments for an object in equilibrium?

The sum of the clockwise moments is equal to the sum of the anti-clockwise moments for an object in equilibrium.

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What is meant by the term couple?

A pair of equal and opposite parallel forces that produce rotation about a point.

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How can the size of a moment be increased?

  1. Increase the distance from the force to the pivot point.
  2. Increase the size of the applied force.

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What is meant by the term centre of mass?

The point through which a single force on the body has no turning effect.


It is the point where we consider the weight of the object to act.

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Where does the centre of mass act on a uniform regular shape?

In the centre.

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