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प्रश्न
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
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उत्तर
Due to frictional force acting on it which resists/opposes the motion of the object.
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संबंधित प्रश्न
Friction depends on the ______ of surfaces.
When a glass rod is rubbed with a piece of silk cloth the rod ______.
Fill in the blank.
We use ball bearings to .................. the friction.
When you apply brakes, the bicycle stops and the rim of the wheel becomes hot? Explain the reason.
Answer the following in short.
Define force. Write its SI unit.
Answer the following in detail.
What are the various effects of force? State one example of each.
Tick the most appropriate answer.
Friction for an object can be reduced by
Fill in the blank
Rolling friction is ............. than sliding friction.
Answer the following in short.
When you push something heavy, the resistance you feel decreases as soon as the object starts moving. Explain the reason.
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 |
