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A small pebble tied at one end of a stri...

A small pebble tied at one end of a string in placed near the periphery of a circular disc, at the centre of which the other end of the string is tied to a peg. The disc is rotating about an axis passing through its centre.
(a) What will be your observation when you are standing outside the disc? Explain.
(b) What will be your observation when you are standing at the centre of the disc? Explain.

Text Solution

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(a) The pebble moves in a circular path because the tension in the string provides the required centripetal force. (b) The pebble is stationary just in front because the centrifugal force on the pebble balances the tension in the string.
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