What is meant by negative work ? Give example.

Explanation

(i) If a force acting on the body in the opposite direction of displacement, the work done is negative.
(ii) For negative work `(90^(@)lt theta lt 180^(@))`
i.e., `- 1 lt cos theta lt 0`.
Example : In a foot ball game, the goal keeper catches the ball coming towards him by applying force such that the force is applied in a direction opposite to that of the motion of the ball till it comes to rest in his hands. During the time of applying the force, he does a negative work on the ball.