Question

Assertion:Work done by centripetal force in moving a body along a circle is zero

Readon(R) :This is because displacement of the body is along the force. ​

Answer 1

Answer:

Work done by centripetal force in moving a body along a circle is zero . Because force acting always perpendicular to displacement.

Work Done = F . d = F × d × cos(α)

where,

. = dot product

F = Force vector, F = magnitude of Force vector

d = Displacement vector ,

d = magnitude of displacement vector

If angle between F and d is 90 degree

then cos(α) = 0 , work done = 0