Which of the following statements about friction is correct?
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A.
Kinetic friction is greater than static friction.
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B.
Friction is independent of the surface area in contact.
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C.
Friction force does not depend on the nature of surfaces.
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D.
Friction does not depend on the normal reaction.
Correct Answer:
B. Friction is independent of the surface area in contact.
Explanation:
The correct answer is Friction is independent of the surface area in contact.
Friction is a force that opposes the relative motion between two surfaces. While it depends on the nature of the materials and the normal force pressing them together, it is independent of the apparent area of contact for most dry, solid surfaces. Kinetic friction is typically less than static friction because it is easier to keep an object moving than to start its motion from rest. Additionally, friction is directly influenced by the normal reaction and the roughness or smoothness of the surfaces involved. Therefore, the statement regarding its independence from surface area is the accurate physical principle among the choices.
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