Question

When particle revolves with uniform speed on a circular path

• A. no force acts on it
• B. no acceleration acts on it
• C. no work is done by it
• D. its velocity is constant

Answer 1

The correct option is C no work is done by it

Centripetal force is always directed towards the center of the circular path and always directed perpendicular to the direction of displacement of particle every where on the circular path. Therefore angle between centripetal force F and displacement S is 90deg. Work
$W=F.ds=F.s.cos\left({90}^0\right)=0$