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Question

A piece of chalk is going around a fixed axis 00' as shown in figure such that it takes equal amount of time in completing each revolution about 00' as well as about its own Axis AB. (which passes through its centre and is parallel to 00') What can be said about this type of motion of this chalk piece?



Correct Answer
A

Pure rotation 

Your Answer
B

Pure translation

Your Answer
C

Pure rotation and translation 

Your Answer
D

Neither pure rotation nor pure translation 


Solution

The correct option is A

Pure rotation 


Here all the points of the body go around 00' in a circular fashion. Also the centre of all such circles lies on 00'.
Try to visualize.
Again the planes containing the individual circles are perpendicular to 00', and parallel to each other at all instants.

What do you think now?

Yes it is indeed pure rotational motion.

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