Moments

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A moment is a measure of the turning effect of a force on a body. You can use moments to answer questions about rods in equilibrium. If a force of magnitude FN acts at a perpendicular distance x m from a point P, the moment of F about P is Fx: \math-container{moment = force × distance}

Moments

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A seesaw consists of a beam AB of length 7m supported by a smooth pivot at its centre C,
Emma has mass 40 kg and sits on the end B. Paul has mass 50kg and sits at a distance xm from C.

The beam is modelled as a uniform rod.

Find the value of x for which the seesaw rests in horizontal equilibrium.

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