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How does the coefficient of friction in a healthy human joint compare with the coefficient of friction of ice sliding on ice?
AIt is roughly three to four times smaller than that of ice on ice
BIt is roughly three to four times larger than that of ice on ice
CIt is exactly the same as that of ice on ice
DJoints produce no measurable friction at all
Answer & Solution
Correct answer: A. It is roughly three to four times smaller than that of ice on ice
1. The source compares joint friction with the friction of walking on ice.
2. It states that joints have much smaller coefficients of friction, often three or four times less than ice.
3. That rules out the option claiming joints have larger friction than ice.
4. Joints do still produce some friction, since synovial fluid only reduces it rather than eliminating it, so the zero-friction option is wrong too.
_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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