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Question

Which one of the following forces is a contact force?


A
Force of gravity
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B
Force of friction
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C
Magnetic force
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D
Electrostatic force
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Solution

The correct option is D Force of friction
Friction is a surface phenomenon. When two surfaces have irregularities that come in contact they get interlocked preventing them from sliding against each other. So, the frictional force is a contact force dependent on the surface.
Here, option (B) is correct. 
Gravitational force, electrostatic force, and magnetic force do not depend on the surface.

Physics

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