Question

A simple pendulum of length l and with a bob whose mass is m is moving along a circular arc of angle θ in a vertical plane. A sphere of mass m is placed at the end of the circle. What momentum will be given to the sphere by the moving bob?

(a) Infinity

(b) Constant

(c) Unity

(d) Zero

The question was asked during an internship interview.

Asked question is from Periodic Motion topic in chapter Oscillations of Engineering Physics I

Answer 1

Correct choice is (d) Zero

To explain: The momentum given to the sphere by the moving bob is zero because the velocity of the bob at the end of the arc will be zero.