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प्रश्न
Answer the following in detail.
Write the characteristics of the force of friction?
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उत्तर
Characteristics of the force of friction are :
- Friction opposes the direction of motion.
- It depends on the nature of the surface that is in contact. Rough surfaces offer a greater degree of friction as compared to smooth surfaces. More the roughness of a surface, the greater is the friction.
- Friction depends upon the weight of the object – greater is the weight of the object, greater is frictional force it faces.
- Friction is independent of the area of the surface in contact when the weight remains unchanged.
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संबंधित प्रश्न
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
Give three examples to illustrate that friction is a necessary evil.
Fill in the blank.
.................... is the SI unit of force.
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Tick the most appropriate answer.
Force of friction comes into play when a/an
Fill in the blank
Rolling friction is ............. than sliding friction.
Fill in the blank.
Smoother the surface, ................. is the frictional force offered by it.
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?
A moving body comes to rest due to friction alone.
Rolling friction is slightly greater than sliding friction.
