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The magnitude of maximum static friction is the coefficient of static friction times the:
ANormal angle
BNormal radius
CNormal force
DNormal speed
Answer & Solution
Correct answer: C. Normal force
1. Pressing surfaces together harder makes them grip harder.
2. The measure of that pressing is the perpendicular contact force.
3. So it is multiplied by the normal force.
_Source: OpenStax University Physics Volume 1, Chapter 6, Applications of Newton's Laws._
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