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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 is ............. than sliding friction.
Fill in the blank.
Friction is a type of .................
State if the following statement is true or false. Correct the statement if it is false.
Friction is offered by all the three states of matter.
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?
Answer the following in short.
How can sliding friction be changed into rolling friction easily?
Answer the following in detail.
Write the characteristics of the force of friction?
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
Complete the analogy.
Knot in a thread : ______ friction :: Ball bearing : ______ friction.
