Question

define motion and periodic motion

Answer 1

A body is said to be in motion if it changes its position with respect to a stationary object around it.
Periodic motion : a motion that repeat s itself after a regular interval of time is called periodic motion.
Example : swinging of a pendulum , rotation and revolution of Earth . Etc

Answer 2

Explanation:

MOTION:

WHEN A BODY CHANGES ITS POSITION WITH RESPECT TO ITS SURROUNDING IT IS SAID TO BE IN MOTION

PERIODIC MOTION:

WHEN A BODY REPEATS ITS MOTION AT EQUAL INTERVALS OF TIME IT IS SAID TO BE PERIODIC MOTION