Easy
When milk is shaken in a glass,it becomes still after some time. Why?
(N/A) When milk is shaken,the layers of the liquid move with different velocities. The viscous force (internal friction) acts between these layers,which opposes the relative motion between them. This force dissipates the kinetic energy of the liquid into heat energy. Consequently,the velocity of the layers gradually decreases until the milk comes to rest.
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