Question

What is force is friction

Answer 1

Actually whenever the surface of a body slides over the surface of another body is body exert a frictional force on the other body which is parallel to the surface in contact the frictional force on a body is opposite to the direction of its motion related to other the body slide over the surface of table from left to right frictional force acting on the book is directly to the left equal a force acts on a table directly to the right

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.