Question

Identify the motion from the following which are both circular and periodic in nature:

• A. pendulum of a clock.
• B. motion of merry go round.
• C. revolution of moon around earth.
• D. movement of hands of clock

Answer 1

Answer: (B), (C), (D)

The correct options are
B motion of merry go round.
C revolution of moon around earth.
D movement of hands of clock

Pendulum of a clock does to and fro motion hence it is periodic in nature, but it does not move in a circle. Hence not a circular motion.

Merry go round move on a circular path, hence it does a circular motion. It also repeats its motion after a certain interval of time.

Motion of moon around Earth is following the circular path, hence circular motion. It also revolves around Earth in a repetitive way. So it is periodic in nature.

Hands of clock moves in a circular path, hence it is in circular motion. It also crosses the marked numbers after certain interval of time. Hence periodic in nature.