Physics - NLM Question with Solution | TestHub
PhysicsNLMFrictionMedium2 minQB
PhysicsMediumstatement
Statement I: Polishing two surfaces beyond a limit can make the friction between them increase instead of decrease.
Statement II: Very smooth surfaces come into intimate contact, and the resulting intermolecular adhesion adds to the resistance to sliding.
Options:
Answer:
A
Solution:
Past a point, polishing removes the gaps that kept the surfaces apart, and molecular attraction (cold welding tendency) raises the friction.
Both statements are true.
Option A.
Stream:JEESubject:PhysicsTopic:NLMSubtopic:Friction
⏱ 2mℹ️ Source: QB
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