Question

What is frictional force?
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Answer 1

Answer:

The force that resists the motion of an object moving on a surface is known as the frictional force.

Answer 2

Answer:

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When a motion occurs or about to occur between the two surfaces in contact, at that time because of interlocking of irregularities these surfaces oppose the motion.

Resisting force, generated due to the interlocking, opposite to the motion is called the force of friction.

Frictional forces arise from complex interactions between the surfaces of objects.

Even very smooth surfaces are actually are very rough on the microscopic level.