Question

define peroidic motion

Answer 1

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☆Periodic motion, in physics, motion repeated in equal intervals of time. 
☆Periodic motion is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the Earth in its orbit around the Sun, and a water wave.
☆SHM ( SIMPLE HARMONIC MOTION) is a special case of periodic motion.


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Answer 2

Motion which repeat itself in equal interval of tume is known as Periodic Motion.

Eg - Pendulum (refer the above fig)