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प्रश्न
List three ways of reducing friction.
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उत्तर
Ways to reduce friction:
- Providing ball bearings or wheels between the moving parts of the machine or vehicles reduces friction and allow smooth movement as rolling friction is less than sliding friction.
- Oiling or lubricating (with graphite or grease) the moving parts of a machine reduces friction. Fine powder like talcum powder also works as a lubricant to reduce friction.
- Polishing the rough surface reduces friction offered by it.
- Streamlining (giving special shape to experience minimum drag) the bodies of aeroplanes, cars, boats, and ships help reduce drag (fluid friction) while travelling through air or water.
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संबंधित प्रश्न
Fill in the blank.
We use ball bearings to .................. the friction.
Answer the following in detail.
What are the various effects of force? State one example of each.
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
Fill in the blank.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
Tick the most appropriate answer.
Friction is offered by
Fill in the blank.
Rolling friction is ........... than sliding friction.
Answer the following in short.
How can sliding friction be changed into rolling friction easily?
Answer the following in detail.
Define friction and explain how it is useful to us.
Answer the following in detail.
Write the characteristics of the force of friction?
Why is a ball bearing used in a cycle hub?
