Work done by an individual force is zero if the work done by the resultant force is also zero.

Work done by a frictional force is

Work done by a frictional force is

Work done by a spning force is

Work done by a spring force is

Work done by a force on an object is zero, if

Work done by frictional force

The work done by the force of gravity is 100 J

A : When a body moves in a circle the work done by the centripetal force is always zero. R : Centripetal force is perpendicular to displacement at every instant.