Question

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

Answer 1

Let a constant force, $F$ act on an object. Let the object be displaced through a distance $S$ in the direction of the force. Let $W$ be work done. We define work to be equal to the product of the force and displacement.

Work done $=force\times displacementW=F\times S$.