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प्रश्न
Fill in the blank.
Smoother the surface, ................. is the frictional force offered by it.
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उत्तर
Smoother the surface, lesser is the frictional force offered by it.
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| Column I | Column II | |
| a) | Static friction | Viscosity |
| b) | Kinetic friction | Least friction |
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| d) | Friction between the liquid layers | Objects are sliding |
| e) | Sliding friction | Objects are at rest |
Assertion: Friction always opposes the motion.
Reason: Whenever one surface moves or tries to move over another surface, the force of friction starts acting on the surfaces.
