Question

A force of 10 N creates a displacement of 2 m but the work done on the body throughout its motion is equal to 70 J. What possibly can be the reason or this?

(a) There are multiple forces action on the body

(b) The body is at rest

(c) The force is not uniform

(d) The displacement is harmonic

This question was addressed to me during a job interview.

Question is from Work topic in chapter Work, Energy and Power of Physics – Class 11

Answer 1

Correct answer is (a) There are multiple forces action on the body

To explain I would say: The possible reason for this is that multiple forces are acting on the body at different instances throughout its motion. The work done on a body is a measure of the energy exchanged between the body and the environment and is usually the total work done. Work done due to the given force is 20 J but this need not be the total work done.