Question

A small pebble tied at one end of a string is 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.
What will be your observation when you are standing outside the disc? Explain.

Answer 1

When we are standing outside the disc, we observe that the pebble moves in a circular path and the tension in the string provides the required centripetal force.