Work:

            Work is done when a force acting on a body displaces it in the direction of a force. Work is a scalar quantity. It depends on the force acting on a body, displacement of the body, and the angle between them.

Work done = Force x displacement

Or          W = F S........ (i)

              W = $F_{x} \times S$
              W = $(F cos \theta) S$
              W = $FS cos \theta$ ........(ii)

Unit of work:

            SI unit of work is the joule (J). it is defined as

            The amount of work is one joule when a force of one newton displaces a body through one meter in the direction of the force.

Thus                              $1 J = 1 N \times 1 m$