Question

3. When is the work done by a force on a body said
to be positive? Give two examples.​

Answer 1

Explanation:

when the body is in the motion it is sait to be work done by a force on a body which is positive

Answer 2

Answer:

If the displacement of the body is in the direction of force. then work done is positive.

Hence, F×S

For example: A coolie does work on the load when he raises it up against the force of gravity. The force exerted by coolie (=mg) and displacement. both an in upward direction.

For example: When a body moves on a surface. the force of friction between the body and the surface is in direction opposite to the motion of the body and so the work done by the force of friction is negative.

Explanation:

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