AP Physics B Practice Exam

Category - Introductory Physics

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Which of the following statements best explains why it is usually easier to keep a sliding object moving than it is to start the object moving?

Kinetic friction is typically equal to static friction.
Kinetic friction is typically less than static friction.
Kinetic friction is a force that resists attempts to start an object moving.
Kinetic friction is a force that opposes the sliding of two objects over each other.

Explanation

Answer: B - Kinetic friction is typically less than static friction.

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