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Question

Which one of the following is not an example of periodic motion?

A
Heartbeat of a healthy person
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B
The motion of a pendulum
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C
Apple falling from a tree
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D
Moon’s motion around the earth
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Solution

The correct option is C Apple falling from a tree
Motion which repeats itself after a regular interval of time is called periodic motion.

The beating of the heart of a healthy person is periodic in nature as it repeats after a fixed interval of time. Similarly, the motion of a pendulum and the moon’s motion around the earth are also periodic in nature.

But once an apple falls off a tree, it stays on the ground. Since the motion is not repeated, therefore it is not periodic in nature.
The motion of an apple falling from a tree is an example of the rectilinear motion as it falls vertically down due to gravity.

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