GCSE Physics

Balancing Many Moments

We have seen that more than one moment can act in one direction. We may sometimes wish to work out how these could be balanced.

At what distance must the 6 N force act to balance the other forces?

When balanced: sum of clockwise moments = sum of anticlockwise moments

It is easily shown that the clockwise moment = 3.0 Nm. To balance this, the anticlockwise moment must also be 3·0 Nm. So:

6 × d = 3·0
d = 3·0 ÷ 6 = 0·5 m

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