Question

Definition of periodic motion and non periodic motion

Answer 1

Periodic motion= Any motion that repeats itself after a fixed interval of time is called periodic motion
Non periodic motion =The motion that does not repeat itself at regular interval of time is called non periodic motion.

Answer 2

$\bf\pink{periodic \: motion}$

The motion which gets repeated after regular intervals of time is called periodic motion.

$\bf\pink{non - periodic \: motion}$

The motion which does not repeat itself after a regular interval of time is called non-periodic motion