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Friction arises partly because surfaces that look flat are actually:
ARough
BRound
CRigid
DRinged
Answer & Solution
Correct answer: A. Rough
1. A close-up view of any surface shows peaks and valleys.
2. Sliding forces those irregularities past each other.
3. The surfaces are rough.
_Source: OpenStax University Physics Volume 1, Chapter 6, Applications of Newton's Laws._
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