Question

When does work done by force is zero.

Answer 1

Hi Avinash!

The work done by a force is the dot product of force (F) and displacement (S). That is,

Work done (W) =F.S =FS cosθ .

So, when the displacement is at right angle to the applied force, the work done will be zero, because cos 90^o = 0. If the displacement is along the direction of the applied force, the work done will be positive and if the displacement is in a direction opposite to the applied force, the work done will be negative.

Cheers!!