The work done by a constant force of magnitude F on a point that moves a displacement (not distance) s in the direction of the force is the product

W = F s {\displaystyle W=Fs} .

For example, if a force of 10 newtons (F = 10 N) acts along a point that travels 2 meters (s = 2 m), then it does the work W = (10 N)(2 m) = 20 N m = 20 J. This is approximately the work done lifting a 1 kg weight from ground level to over a person's head against the force of gravity. Notice that the work is doubled either by lifting twice the weight the same distance or by lifting the same weight twice the distance.


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