Question

Friction is a type of a __________ force which opposes the__________ between two surfaces.

• A. contact, relative motion
• B. non-contact, pressing force
• C. non-contact, relative motion
• D. contact, pressing force

Answer 1

The correct option is A contact, relative motion

A force which can be exerted by an object on another object only through physical touching is called a contact force.
Friction is an example of contact force.
Frictional force is an opposing force which acts between two or more surfaces or points in contact, when there is relative motion between them.