Radha was making coffee for her sister. She stopped stirring coffee but swirling motion continued for some time .She was wondering how this can happen .Can you help her in explaining in terms of inertia

Explanation:

Inertia is one of the major properties of all objects which makes an object at rest to be reluctant to move and an object in motion to be reluctant to stop.

Therefore during the stirring of the coffee, the molecules of the mixture were in a continuous circular motion. But after the stirring has ceased, the molecules were reluctant to stop. Thus the motion continues for sometime until some available damping forces acts.

Thus the observation by Radha with respect to the motion of the coffee.