What is meant by periodic and non-periodic motion ? Give any two examples , for each motion ?

Explanation

1. Periodic motion :
Any motion which repeats itself in a fixed time interval is known as periodic motion .
Examples : Hands in pendulum clock , swing of a cradle the revolution of time Earth around the Sun, waxing and waning of Moon, etc.
2. Non- Periodic motion :
Any motion which does not repeat itself after a regular interval of time is known as non- periodic motion .
Example : Occurance of Earth quake , eruption of volcano, etc.