Discussion
Thick film or hydrodynamic lubrication keeps the surfaces apart by a film that is
Answer: D
Correct answer: thick enough that no asperities touch
In hydrodynamic lubrication the relative motion drags oil into a converging gap and generates a pressure that lifts the surfaces apart, so the film is thicker than the combined roughness and no metal touches. Friction is then that of the oil alone and wear is essentially nil, which is why bearings are designed to run in this regime.
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