Question

• A contact force that opposes the relative motion between two surfaces in contact is

(a) muscular force
(b) frictional force
(c) electrostatic force
(d) magnetic force
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Answer 1

Answer:

Friction force is the force which acts between the two surfaces that have relative motion with respect to each other and it always opposes the relative motions. In simple words, friction force acts between the two sliding surfaces or trying to slide across each other

Answer 2

A contact force that opposes the relative motion between two surfaces in contact is

(b) frictional force