Question

What should be the angle between the force and displacement of maximum work?

Answer 1

Work done, $dW$ = $\overrightarrow{F}.\overrightarrow{ds}$

= $\left|\overrightarrow{F}\right|\left|\overrightarrow{ds}\right|cos\Theta$

Therefore , work done is maximum when $cos\Theta$ is maximum and

$cos\Theta =0$ .

Hence , the work done is maximum when the force is parallel

to the displacement.