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What is the condition for a force to do work on a body?
As we know the expression for work done $W=F\times d\cos\theta$
Here, $W\rightarrow$ work done
$F\rightarrow$Applied force
$d\rightarrow$displacement in the body
$\theta\rightarrow$angle between the directions of applied force and the displacement in the body.
If $\theta=90^o$
Then, the work done $W=f\times d\times 0=0$ [$\cos\theta=\cos90^o=0$]
So, for the work done there must be a force acting on the body which can cause displacement in the body. And the directions of the acted force should not be perpendicular to the direction of the displacement.
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