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State the conditions under which a force...

State the conditions under which a force does no work .

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(1) When force (F) and displacement (S) are mutually perpendicular then work done is zero .
`thereforeW=bar(F).bar(S)=|F|" "|S|costheta" when"theta=90^(@)` work W = 0
Even though force is applied if displacement is zero then work done W = 0 .
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