Question

The change in the total energy of a body moving because of work being done on it is attributed by the change in kinetic energy only when ______

(a) It moves extremely slowly

(b) It moves with a very high velocity

(c) It moves on an equipotential surface

(d) It moves with a positive acceleration

I had been asked this question in an interview for job.

This interesting question is from Work-Energy Theorem topic in division Work, Energy and Power of Physics – Class 11

Answer 1

Correct option is (c) It moves on an equipotential surface

Easiest explanation: An equipotential surface is defined as a surface on which the potential of the body is same everywhere. Hence the potential of a body moving on an equipotential surface does not change. Therefore, the total change in energy is attributed by the change in the kinetic energy of the body.