Answer:
Pendulum is a simple device which shows periodic motion. A simple pendulum consists of a nonmagnetic metal ball called bob. This bob is suspended with the help of a string. The open end of the string is tied to a support. Bob of the pendulum is held at a side and released. It starts moving in a to and fro motion. This is called an oscillatory motion. The time taken by the pendulum to complete one oscillation is called time period. This time period is always same with a pendulum having same length. Time period changes with the change in the length of the string. The string of the pendulum is so adjusted to the length that it completes one oscillation in one second and it keeps on moving the clock giving us time. It has been found that a pendulum of about 25 cm length takes exactly one second to complete one oscillation.
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