Question

State whether true or false. The rotation of the moon around the earth is a periodic motion.

• A. True
• B. False

Answer 1

The correct option is A True

Explanation

1. If a body recurs its motion along a definite path, about a certain point after a fixed interval of time is called the periodic motion.
2. The fixed interval of time after which the motion is repeated is called the period of motion.
3. Circular motion can be considered as a periodic motion as in circular motion the motion repeats itself after an equal interval of time.
4. A circular motion persists in that motion due to continuous acceleration.
5. The motion of the Moon around the Earth in a circular path is an accelerated motion.
6. The earth exerts a centripetal force in the form of gravitational force, on the moon due to which the moon undergoes a circular motion with some centripetal acceleration.
7. So the Moon revolves around the Earth in a circular motion.
8. The rotation of the moon takes $29$ days to complete $1$ rotation. So after every $29$ days moon came back to its initial position.
9. So the rotation of the moon around the earth repeats after regular intervals of time, hence, it is a periodic motion.

Hence, the given statement is true.