A small glass marble is put on a smooth gramophone disc. When the disc starts rotating, the marble flies off the disc. Explain why.

A small glass marble is put on a smooth gramophone disc. When the disc

1.	A small glass marble is put on a smooth gramophone disc. When the disc starts rotating, the marble flies off the disc. Explain why.
Answer» Solution :When the disc starts rotating, the marble flies off because the FRICTIONAL force between the SURFACE of the GRAMOPHONE disc and the marble cannot provide the NECESSARY centripetal force required by the marble for its revolution.