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प्रश्न
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
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उत्तर
Ways by which friction can be increased are :
- Tires of all vehicles have grooved designs or treads to make their surface rough. The roughness of a surface increases friction and prevents a vehicle from slipping or skidding on a wet or muddy road.
- Spikes in the shoe soles used by players and athletes increase friction and they get a firm grip on the ground. The soles of footwear are also provided with grooved designs to increase friction and avoid slipping.
- The handles of motorbikes are covered with spiked rubber to provide a good grip and have better control in holding the handles.
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संबंधित प्रश्न
Give examples to show that friction is both a friend and a foe.
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
Answer the following in short.
Define force. Write its SI unit.
Tick the most appropriate answer.
Friction for an object can be reduced by
Answer the following in a word or two or in a sentence.
Name a method used to reduce friction.
A moving body comes to rest due to friction alone.
Rolling friction is slightly greater than sliding friction.
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 |
Is there any possibility of making a special device to measure the magnitude of friction directly?
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.
