GCSE Physics

Many Moments

Sometimes more than one force acts on the same side of the pivot. Their overall turning effect is easy to work out.

2 forces, both acting clockwise, 2 N and 5 N at 0.2 m and 0.5 m respectively

The 2 N force has a moment of 2 × 0·2 m = 0·4 Nm clockwise.
The 5 N force has a moment of 5 × 0·5 m = 2·5 Nm clockwise.

Their combined moment = 0·4 Nm + 2·5 Nm = 2·9 Nm clockwise.

Moments can just be added, but they must act in the same direction.


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