What is the difference between a simple pendulum and a compound pendulum??
Simple pendulum: A simple pendulum is a heavy point mass suspended from a rigid support by a massless string and inextensible string.
The frequency of simple pendulum depends upon length of a string and acceleration due to gravity.
Compound pendulum: The compound pendulum is a body which is able to oscillate about a horizontal axis through it.
The frequency of compound pendulum depends upon radius of gyration, mass of pendulum and acceleration due to gravity.