Question

State coulomb's laws of dry friction.

Answer 1

The law states that for two dry solid surfaces sliding against one another, the magnitude of the kinetic friction exerted through the surface is independent of the magnitude of the velocity (i.e., the speed) of the slipping of the surfaces against each other.

Note that the direction of the kinetic friction does depend on the direction of the velocity -- it is precisely the opposite direction.

Coulomb's law of friction is part of the Coulomb model of friction, a model for the behavior of frictional forces between two dry solid surfaces in contact.

Answer 2

Coulomb's law states that the force between two point charges are directly proportional to the product of charges and inversely proportional to the square of distance between them.