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The frictional force is directly proportional to the surface of the solid.

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The frictional force is directly proportional to the surface of the solid.

(a) True

(b) False

This question was addressed to me in an online quiz.

This question is from Problems Involving Dry Friction topic in chapter Friction of Engineering Mechanics

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Correct answer is (b) False

The best explanation: The frictional force is directly proportional to the vertical forces that are being applied normal to the surface of the body. The force of friction is not dependent on the type of the surface. Thus the only thing the frictional force does depend is the normal force.

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