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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
Friction depends on the ______ of surfaces.
Write true or false.
The sliding friction is more than the rolling friction.
Name the two kinds of forces in nature.
Answer the following.
What do you understand by a force?
Fill in the blank.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
State if the following statement is true or false. Correct the statement if it is false.
Friction has no relation with our walking or running.
Answer the following in a word or two or in a sentence.
Name a method used to reduce friction.
Rolling friction is slightly greater than sliding friction.
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
Why is a ball bearing used in a cycle hub?
