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Question

When is the work done positive and negative?


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Solution

Step 1:Positive Work

Work done is positive when a force acts in the direction of motion of the body.

Example: When a football is kicked, then the football will travel along the direction of force applied. Therefore, work done on football will be positive.

Step 2:Negative Work

Work done is negative when a force act in the opposite direction of the motion of the body.

Example: When a ball is thrown upward in the air, the ball moves against the force of gravity. Work done by force of gravity is negative.


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