When is the work done by a force on a body: (a) positive, (b) neg… - Vidyadip

Question

When is the work done by a force on a body: (a) positive, (b) negative, and (c) zero?

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Answer

Work done by a force applied on a body is:

Positive work: Positive when the force acts in the direction of motion of the body.
Negative work: Negative when the force acts in the direction opposite to the direction of motion of the body.
Zero work: Zero when the force acts at right angle to the direction of motion of the body.

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