Question

What force is a contact force?

Answer 1

It is any force that requires contact to happen. There is frictional force, applied force, and normal force.

Answer 2

A contact force is any force that requires contact to occur. ... Contact forces are often decomposed into orthogonal components, one perpendicular to the surface(s) in contact called the normal force, and one parallel to the surface(s) in contact, called the friction force. Hope this helps you