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Question

Which one of the following is most likely not a case of uniform circular motion?
(a) motion of the earth around the sun
(b) motion of a toy train on a circular track
(c) motion of a racing car on a circular track
(d) motion of hours' hand on the dial of a clock

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Solution

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.

The tip of a hours' hand of a clock exhibits uniform circular motion on the circular dial of the clock.

The movement of the earth around the sun is also a uniform circular motion.

Similarly, the motion of a toy train on a circular track is also a uniform circular motion since its speed remains constant.

The motion of a racing car on a circular track changes its speed, that is, it increases or decreases speed during the drive which is not a case of uniform circular motion.

Hence option (c) is correct.


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