Question

A toy is acted upon by a force. State two conditions under which the work done could be zero.

Answer 1

We know that W = FScosθ. clearly, work done by the force will be zero if. 

1. S = 0 i.e., no displacement takes place 

2. If θ = 90°, then cos 90° = 0, and W = 0;.e., when the force acts perpendicular to the direction of motion.