Why is that a liquid set in motion comes to rest after some time?

Components of a binary mixture of two liquids A and B were being separated by distillation. After some time separation of components stopped and composition of vapour phase becomes same as that of liquid phase. Both the components started coming in the distillate. explain why this happened.

Why is the simple harmonic motion so named?

Why does water split on the floor disappear after some time?

Can an object be at rest as well as in motion at the same time ?

A metal disc is winging freely between the poles of an electromagnet, as shown in the figure. When the electromagnet is switched on, the disc comes to rest after a few oscillations. Explain why eddy currents are induced in the metal disc.