alleryStart learning →Which symbol in the kinetic friction relation stands for the coefficient of kinetic friction?
AThe symbol for the normal force
BThe symbol for the applied push
CThe symbol for the contact area
DThe Greek letter mu with a k
Answer & Solution
Correct answer: D. The Greek letter mu with a k
1. Kinetic friction is written as a coefficient multiplied by the normal force.
2. That coefficient is written as the Greek letter mu carrying a subscript k.
3. The subscript marks it as the kinetic case, as against the static coefficient.
4. The letter N in the same relation stands for the normal force, not for a coefficient.
_Source: OpenStax College Physics (CC BY 4.0), Ch 5 "Further Applications of Newton's Laws: Friction, Drag, and Elasticity", section Magnitude of Kinetic Friction_
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