Question

Why is the work done on an object moving with uniform circular motion zero?​

Answer 1

Explanation: Work done is equal to Force (acting in the direction of displacement) times the displacement i.e. W=F.S where (.) is dot product. ... Scos(θ), since body is moving in circular track cos(θ)=0 , and hence whole term will be 0 i.e. Work done will be 0.

The only force is the centripetal force, which points in a direction along the radius of the circle, and since the radius of the circle never change, there is no displacement along this direction, and the work done by this force is zero.