Where we've got to with contact forces(Summary)

A summary of contact forces

There are three kinds of contact forces that can support an object.

Warp forces can be found wherever a solid is distorted by an object:

You might, for teaching purposes, combine these two and call them warp forces — with the forensic clue that if an solid in contact with the object is stretched or squeezed then you can add an arrow labelled warp force.

Frictional forces of three kinds can be found at the surfaces of the object when it moves, or makes to move, past other particles its environment.

You might, for teaching purposes, combine these three and call them frictional forces — but we'd not recommend that as it obscures the very different reasons for adding the arrows.