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Periodic Motion Definition If a body recurs its motion along a definite path, about a certain point after a fixed interval of time is called the periodic motion. The fixed interval of time after which the motion is repeated is called the period of motion.

In order to measure time, we need a motion that repeats itself in equal intervals. Such a motion is called periodic motion . Some examples of periodic motion are the rotation of the Earth about its axis, the revolution of the Earth around the sun, the revolution of the moon around the Earth, the to-and-fro movement of a spring, and the oscillation of a pendulum.

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