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A book is already sliding down a ramp. The friction acting on it is now described as:
AKinetic
BKindred
CKnotted
DKneaded
Answer & Solution
Correct answer: A. Kinetic
1. The surfaces are in contact and moving relative to one another.
2. That is the moving case, not the stationary one.
3. The friction is kinetic friction.
_Source: OpenStax University Physics Volume 1, Chapter 6, Applications of Newton's Laws._
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