A weightlifter lifts a weight off the ground | vedclass

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Question

(C) In physics,work is defined as the product of force and displacement in the direction of the force $(W = Fs \cos 	heta)$.$(i)$ When the weightlift

Vedclass · Accepted Answer

Work is done in lifting the weight,but no work is required to be done in holding it up.

Vedclass · Answer

(C) In physics,work is defined as the product of force and displacement in the direction of the force $(W = Fs \cos 	heta)$.$(i)$ When the weightlifter lifts the weight,there is a displacement $(s > 0)$ in the direction of the applied force. Therefore,work is done $(W = Fs > 0)$.$(ii)$ When the weightlifter holds the weight stationary,the displacement is zero $(s = 0)$. Since work requires displacement,the work done while holding the weight is zero $(W = F 	imes 0 = 0)$.

$A$ weightlifter lifts a weight off the ground and holds it up.

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