Question

what is a bob in pendulum

Answer 1

Although a pendulum can theoretically be any shape, any rigid object swinging on a pivot, clock pendulums are usually made of a weight or bob attached to the bottom end of a rod, with the top attached to a pivot so it can swing.

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Answer 2

A bob is attached to a string in simple pendulum made up of brass which helps the pendulum swing in around and fro motion