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

When a force F displaces a body through a distance S in the direction of the applied force, then the work done W on the body is given by the expression: 

Work done = Force × Displacement 

W = F × s

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 × displacement 

W = F × S.

When a force F displaces a body through a distance S in the direction of the applied force, then the work done W on the body is given by the expression :
Work done = Force `xx` Displacement
`W= F xx s`.

If a force F acts on an object and s is the displacement of the object in the direction of force, then :
`"Work done" = "Force " xx " Displacement"`
or `W = F xx s`

If F is the constant force acting in the direction of displacement s, then work done by the force, i.e., `W = F xx s = F s`.