Work done by a force may be positive or negative depending on the angle q between the force and displacement. If the angle q is acute (q < 90o), then the work done is positive and the component of force is parallel to the displacement.
If the angle q is obtuse (q > 90o), the component of force is antiparallel to the displacement and the work done by force is negative.
It is clear from the equation that the work done by a force is zero when
(a) F = 0
(b) s = 0
(c) cosq =l 0
or q = 90o
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