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प्रश्न
Answer the following in short.
Define force. Write its SI unit.
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उत्तर
A push or pull acting upon an object as a result of its interaction with another object is called force. Its SI unit is the newton (N).
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संबंधित प्रश्न
When you apply brakes, the bicycle stops and the rim of the wheel becomes hot? Explain the reason.
Define sliding friction
Define rolling friction
Answer the following in short.
What do you understand by normal force?
Fill in the blank.
More the roughness of a surface, greater is the ........................
Fill in the blank.
Rolling friction is ........... than sliding friction.
Answer the following in a word or two or in a sentence.
Why is difficult for a pen to leave a mark on a highly smooth plastic sheet?
A moving body comes to rest due to friction alone.
Match the following.
| Column I | Column II | |
| a) | Static friction | viscosity |
| b) | Kinetic friction | least friction |
| c) | Rolling friction | objects are in motion |
| d) | Friction between the liquid layers | objects are sliding |
| e) | Sliding friction | objects are at rest |
Friction depends on the ______ of two surfaces in contact.
