Question

which of the following is a contact force (a)gravitational force (b)frictional force (C)magnatic force (D)electrostatic force

Answer 1

Explanation:

Frictional force is a contact force

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Answer 2

Answer:

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 (B) is correct.  

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