A small coin is placed on a rotating table, it is not moving with respect to the table. From where does the coin get the necessary centripetal force?

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Solution

Step 1: Given:
The coin is not moving with respect to the table, i. e., the coin is not slipping over the table's surface.
Step 2: Explanation:
Friction resists the motion of an object when it comes in contact with another surface.
As the coin is not slipping over the table's surface, we can conclude that friction acting on the coin supplies the necessary centripetal force.
And that friction is acting between the table and the coin.
Hence, the coin gets the necessary centripetal force from the frictional force between the coin and the table.

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