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Which of these is the standard everyday example of kinetic friction acting?
AA book resting on a level shelf
BA hockey puck sliding on ice
CA wall standing against the wind
DA stone hanging from a string
Answer & Solution
Correct answer: B. A hockey puck sliding on ice
1. Kinetic friction needs the two surfaces to be moving relative to one another.
2. A puck sliding across ice is exactly that case, and friction is what slows it.
3. A book at rest on a shelf involves static friction rather than kinetic.
4. A hanging stone touches no surface, so no friction of this kind acts at all.
_Source: OpenStax College Physics (CC BY 4.0), Ch 5 "Further Applications of Newton's Laws: Friction, Drag, and Elasticity", section Friction_
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