A friend joins the two children (Q5) and sits on the other end of the see-saw. He weighs 600N. How far from the pivot must he sit to balance the see-saw?

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Pushing or pulling the handle of a wrench connected to a nut or bolt produces a moment (turning force) that loosens or tightens the nut or bolt. In the field of Science, forces can be used to turn objects about a pivot (fixed point).
 


A friend joins the two children (Q5) and sits on the other end of the see-saw. He weighs 600N. How far from the pivot must he sit to balance the see-saw?





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