AP Physics 1 Question 58: Answer and Explanation
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8. Which of the following graphs best represents the force of friction on an object starting at rest that eventually starts sliding across a level surface due to a gradually increasing horizontal force?
Correct Answer: C
C The force of friction on a stationary object will exactly oppose the force applied to it until it reaches a maximum. This eliminates (B) and (D). Once enough force has been applied, the friction will change from static friction to kinetic friction. Kinetic friction is a constant value, so this eliminates (A).