Question

Friction always
are in contact with each other.
any relative motion between the two surfaces that are in contact with each other .​

Answer 1

Answer:

Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact. In situations where the surfaces in contact are moving relative to each other, the friction between the two objects converts kinetic energy into sensitive energy, or heat (atomic vibrations).

HOPE TMIT HELPS!!!!!

Answer 2

Answer:

Friction force always acts tangent to the surface at points of contact. Friction force acts opposite to the direction of motion. There are 2 types of friction: Static friction: If the two surfaces in contact do not move relative to each other, one has static friction.