Friction
Q. Which of the following statements about kinetic friction is true?
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A.
It is always greater than static friction.
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B.
It depends on the speed of the object.
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C.
It is independent of the contact area.
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D.
It increases with increasing normal force.
Solution
Kinetic friction is independent of the contact area and depends only on the normal force and the coefficient of kinetic friction.
Correct Answer: C — It is independent of the contact area.
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