Question

explain why friction is never in zero​

Answer 1

Answer:

because no body is fully elastic

Answer 2

Heyaa,

Actually when the surfaces comes too close to each other, the molecules of this two surfaces also comes close to each other and between them there is always a force of attraction.

If this molecules belongs to different types, the force of attraction is called adhesive

force of attraction and the molecules belongs to the same type of the material, the force of attraction is called a cohesive force of attraction.

Anyway it is always attractive. Hence molecular force of attraction again starts opposing the relative motion. That’s why a friction can only be minimised but cannot be reduced to zero.

Hope it Helps !!