When a body moves in a circular path, no work is done by the force, since
When a body moves in a circular path, no work is done by the force, since
there is no net force
there is no displacement
force is always away from the centre
force and displacement are perpendicular to each other
Solution
When a body moves in a circular path, then centripetal force is always directed towards centre of circular path. Hence, centripetal force and displacement (directed tangentially) are perpendicular to each other.
\(\therefore\) Work done \(W=F s \cos 90^{\circ}=0 \quad\left[\because \cos 90^{\circ}=0\right]\)