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Question

Which one of the following is most probably not a case of uniform circular motion?

A
Motion of a racing car on a circular track
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B
Motion of the moon around the earth
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C
Motion of a toy train on a circular track
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D
Motion of seconds hand on the circular dial of a watch
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Solution

The correct option is A Motion of a racing car on a circular track
Answer is A.
An object moving in uniform circular motion is moving in a circle with a uniform or constant speed. The velocity vector is constant in magnitude but changing in direction.
Hence, the motion of a racing car on a circular track changes it speed, that is, it increases or decreases speed during the drive not a case of uniform circular motion.

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