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Q. 18. In each of the following, a force is acting on an object of mass
. The direction of displacement is from west to east shown by the longer arrow.
Observe the diagrams and state whether the work done by the force is negative, positive or zero.
Answers (1)
(i) In the first case, the force acting on the object is perpendicular to the displacement of the body. Thus the work done by the force is zero.
(ii) In this, the force is in the direction of the displacement, so the work done is positive.
(iii) In this case, the direction of force and displacement are opposite to each other. Thus the work done by the force is negative.
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