Question

State the condition under which force does not work

Answer 1

There are three conditions in which a force doesn't work:-
(a)When the force itself is ZERO.
As: Work=FScosθ
If force is 0 then work will also be 0.
(b)When there is NO displacement.
As: Work=FScosθ
If displacement is 0 then work is also 0.
(c)When the force acts perpendicular to the displacement.That is,θ=90.
As: Work=FScosθ
If θ=90, then cos90=0, therefore the work done will be 0.