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Principle of Moments

Moment of force

Moment of force is the turning effect of a force. Moment is a vector quantity that represents the magnitude of force applied to a rotational system at a distance from the axis of rotation. The moment of a force about a pivot is the product of a force (F) applied and the perpendicular distance (d) from the pivot.

Moment = F X d 

where units for F is Newton (N) and d is metre (m); Moment is Nm

Principle of moments for a body in equilibrium

An object is in equilibrium if the sum of all anticlockwise moments about the pivot is equal to the sum of all clockwise moments about the same pivot. 

Effect of the position of the centre of gravity on an object

The lower the centre of gravity, the more stable an object. Centre of gravity can be lower by making the base of the object as wide as possible. In additional, making the object  short is as well another way of lowering the centre of gravity.

Find out more with diagram illustration on the effect of position of the centre of gravity on an objects on the pivoted metre rule.  



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