Q. 394.6( 12 Votes )

When is the work done by a force on a body?

(a) Positive

(b) Negative, and

(c) Zero?

Answer :

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

For e.g. kicking a football


(b) Work done is negative, when a force acts opposite to the direction of motion of the body


For e.g. when a body is being lifted in the upward direction


(c) Work done is zero when a force acts at right angles to the direction of motion of the body


For e.g. No work is done by the porter in carrying the load.


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