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According to the source, the coefficient of friction between two surfaces is best described as which of these?
AA quantity measured in kilograms per meter
BA quantity always measured in newtons
CA quantity that is always exactly 1.0
DA unitless quantity usually between 0 and 1.0
Answer & Solution
Correct answer: D. A unitless quantity usually between 0 and 1.0
1. The coefficient of friction carries no units of its own.
2. It also gives a typical range for that quantity, usually between 0 and 1.0.
3. Newtons measure force, not a unitless ratio, so that unit does not apply here.
4. A fixed value of exactly 1.0 contradicts the many different values already listed for different surface pairs.
_Source: OpenStax College Physics (CC BY 4.0), Ch 5 "Further Applications of Newton's Laws: Friction, Drag, and Elasticity", section 5.1 Friction_
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