Simple Pendulum

A simple pendulum consists of a small metallic ball suspended from a rigid stand by a thread. The metallic ball is called the bob of the pendulum. When the bob of the pendulum is released after taking it slightly to one side, it begins to move to and fro motion of a simple pendulums is an example of a periodic or an oscillation when its bob, starting from the mean position B, moves to A, to C and back to O. The pendulum also completes one
oscillation when its bob moves from one extreme position A to the other extreme position C and comes back to A. The time taken by the pendulum to complete one oscillation is called its
time period.