Question

what is simple pendulum

Answer 1

well this consists of a metallic Bob tied to a string. the Bob does the oscillatory motion I. e. to and fro motion from mean mean position or mean to extreme position.

Answer 2

A pandulum is a wieght suspended from a pivot so that it can swing freely. When pendulum is displaced sideways from its resting, equilibrium position,it is subject to a restoring force due to gravity