Question

A…………………. motion is that repeats itself again and again after a fixed interval of time.

Answer 1

Periodic motion:

1. A motion that repeats itself again and again after a fixed interval of time is called a periodic motion.
2. Motion of the planet around the Sun and the motion of Earth around the sun are examples of periodic motion.

Non-periodic motion:

1. A motion that does not repeat itself at a regular interval of time is called non-periodic motion.
2. A man walking through a park, or motion of vehicle on the road are the examples of non-periodic motion.

Hence, a periodic motion is that repeat itself again and again after a fixed interval of time.