Chapter 10

NCERT
Class 9
Science
Solutions
18. In each of the following a force F is acting on an object of mass m. The direction of the displacement is from west to east shown by the longer arrow, observe the diagrams carefully and state whether the work done.

Question:

In each of the following a force F is acting on an object of mass m. The direction of the displacement is from west to east shown by the longer arrow, observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.

Answer:

(a) Zero, because there is an angle of 90° between the direction of force and the direction of displacement, that is, perpendicular to each other.

(b)Positive, because the displacement is in the direction of the force.

(c) Negative, because the direction of displacement is opposite to the direction of force.

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