Question

5) which one of the following forces is a contact force
(a) force of gravity
(b) magnetic force
() force of friction
d) electrostatic force
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Answer 1

Answer:

force of friction is contact

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Answer 2

Answer:

() force of friction

Explanation:

Friction is a surface phenomenon. When two surfaces have irregularities that come in contact do they get interlocked preventing them against sliding against each other. So, frictional force is a contact force dependent on surface.

Here, option () is correct.

Gravitational force, electrostatic force and magnetic force does not depend on the surface.