Question

52. 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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Answer 1

(a) motion of the earth around the sun is most likely not a case of uniform circular motion

Because the earth orbits the sun in an elliptical orbit, not in a circular path. And also, the speed of motion is not uniform.

Rest of the cases are all examples of motion in circular path. Though the motions of the toy train and the racing car may not be uniform.

Answer 2

$\bigstar$ 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

$\bigstar$ ​Answer :

(c) motion of a racing car on a circular track

$\bigstar$ Explanation :

• 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.
• It is the worst option including all options.Motion of the earth around the sun is also a case.But it is somewhat obeys uniform circular motion.

                                                                         

$\bigstar$ More Information :

→ Uniform circular motion -

• Motion of a body on circumference of a circle with constant speed is called uniform circular motion.

                                                                         

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