Question

difine periodic motion​

Answer 1

Explanation:

Periodic motion refers to the type of motion which takes place in equal intervals of time.

Ex - 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.

hope it helps you mate...

Answer 2

The periodic motion  is called the motion which occurs at equal intervals of time.

An object is said to be in motion if its position changes with respect to its surroundings in a given time.

To study motion of object , one  has to study the change in position of object with respect to its surroundings.

Example : the motion of planets around the sun , motion of train along a railway track.