Question

A body of mass 50ɡ is movinɡ once round a horizontal circle of radius 5 cm with uniform speed. How much work has been done *​

Answer 1

Given info : A body of mass 50g is moving once round in a horizontal circle of radius 5 cm with uinform speed.

To find : the work done has been done by body is ...

solution : work done is the dot product of force applied on the body and the displacement of that body along force. i.e., W = F × S

here the body is moving in a circular path. so the displacement of body to complete one round = zero

[becuase its initial position is also the final position and we know, displacement is the minimum seperation between two positions of particle or final position - initial position ]

therefore the work done has been done by the body , W = F × 0 = 0