Question

what is force of friction​

Answer 1

Answer:

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. It is a contact force. It can be reduced by lubricating the surfaces.

Explanation:

Answer 2

a force that opposes relative motion or attempts at motion between systems in contact. kinetic friction: a force that opposes the motion of two systems that are in contact and moving relative to one another.