Question

When the displacement is at right angles to the force, work done is _________.

Answer 1

1. Work is said to be done when a force is applied to a body, such that the force causes displacement in the body.
2. If there is a change in direction, then the work done $\left(W\right)$ is given by $W=FS\cos \theta$ where $F$ is the magnitude of force applied, $S$is the displacement and $\theta$ is the angle between the direction of force and the displacement.
3. We know, $\cos \theta =0$.

Hence, when the displacement is at right angles to the force, the work done is zero.