A motion which gets repeated after a regular interval of time is called the periodic motion
- The earth completes one round about the sun in nearly 365 days and this motion is repeated after every 365 days.
- The moon revolves around the earth and completes one round in nearly 27 days and then repeats its motion.
- For a normal person heart beats every 0.8 second.
- The pendulum of a wall clock repeats its motion after every 2s.
- The motion of the needle of a sweing machine the movement of membrane of tabla when played.