Which of the following statements about kinetic friction is true?

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Question: Which of the following statements about kinetic friction is true?

Options:

Correct Answer: It is independent of the contact area.

Solution:

Kinetic friction is independent of the contact area and depends only on the normal force and the coefficient of kinetic friction.

Which of the following statements about kinetic friction is true?

Which of the following statements about kinetic friction is true?

Correct Answer: Kinetic friction is independent of the contact area.

Step 1: Understand what kinetic friction is. Kinetic friction is the force that opposes the motion of two surfaces sliding against each other.
Step 2: Know that kinetic friction depends on two main factors: the normal force (the force pressing the two surfaces together) and the coefficient of kinetic friction (a value that represents how 'sticky' the surfaces are).
Step 3: Remember that the contact area (the size of the surfaces in contact) does not affect the amount of kinetic friction. This means that whether the surfaces are large or small, the kinetic friction will remain the same as long as the normal force and the coefficient of kinetic friction are constant.
Step 4: Conclude that the statement about kinetic friction being independent of contact area and depending only on the normal force and the coefficient of kinetic friction is true.

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