Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
$(a)$. only if the objects are solid
$(b)$. only if one of the two objects is liquid
$(c)$. only if one of the two objects is gaseous
$(d)$. irrespective of whether the objects are solids, liquids or gases

The force of friction comes into play irrespective of whether the objects are solids, liquids, or gases when the surfaces of the objects come in contact or move, and the force of friction tends to oppose the motion.

So, option$(d)$ is correct.

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Updated on: 10-Oct-2022

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