Question

What is friction? What causes friction?​

Answer 1

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Friction is a force that resists the relative motion between two objects or materials. The causes of this resistive force are molecular adhesion, surface roughness, and deformations. Adhesion is the molecular force resulting when two materials are brought into close contact with each other...

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Answer 2

What is friction?

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. Friction opposes the relative motion between two surfaces in contact . It acts on both the surfaces.

What causes friction?

Friction is cause due to the interlocking of irregularities between the two surfaces in contact.

Smooth surfaces have minute irregularities between the two surfaces. Rough surface have larger irregularities between the two surfaces. So force of friction is more if the surface are rough.

(You can refer the image attached with my answer )

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