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प्रश्न
State two factors which directly affect the force of friction.
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उत्तर
Two factors which directly affect the force of friction are:
- The smoothness of the surface.
- The presence of solid, liquid, or gas around the moving body.
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संबंधित प्रश्न
Friction opposes the ______ between the surfaces in contact with each other.
Write true or false.
The sliding friction is more than the rolling friction.
Select the correct alternative.
Friction is reduced by
Give three examples to illustrate that friction is a necessary evil.
Tick the most appropriate answer
Friction always
Fill in the blank.
Friction depends upon the ............... of an object.
Answer the following in short.
List the various states of matter that offer frictional force?
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 |
We have two identical metal sheets. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other. Give reason.
Friction depends on the ______ of two surfaces in contact.
