Question

Write an expression for the work done when a force is acting on an object in the direction of displacement.

Answer 1

1. Work is said to be done when a force is applied to the body and displaces the body.
2. It is expressed as $W=Fs\cos \theta$ where F = force, s = displacement and $\theta$ = angle between the force and the displacement.
3. As force is acting in the direction of displacement, the angle $\theta$ between them would be $0°$.
4. Value of $\cos 0°=1$.
5. Hence, the expression for the given situation is $W=Fs$ and positive.