Question

Definition of periodic motion in science

Answer 1

Periodic motion, in physics, motion repeated in equal intervals of time.periofic 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. ... Simple harmonic motion is a special case of periodic motion

To put in simple words periodic motion is that motion which repeat after fixed interval of time.