Friction is a type of ____ force.
Friction is a force that resists the motion between two bodies that are in contact.
Classify the following amongst contact and non-contact forces: (a) frictional force, (b) Normal reaction (c) force of tension in a string, (d) gravitational force, (e) electrostatic force, (f) magnetic force.
(a) Name two contact forces. (b) Name two non-contact forces.
(a) Define frictional force (or friction)
(b) Explain why frictional force is said to be a contact force.
(c) Explain why magnetic force is said to be a non-contact force.