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प्रश्न
Fill in the blank.
More the roughness of a surface, greater is the ........................
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उत्तर
More the roughness of a surface, greater is the friction.
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संबंधित प्रश्न
Give examples to show that friction is both a friend and a foe.
Give an example to illustrate the existence of the force of friction.
State if the following statement is true or false. Correct the statement if it is false.
If two forces acting in opposite directions on a body arc of equal magnitude, then the body will not move.
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
Fill in the blank.
Sliding friction and rolling friction are types of .................. friction.
Tick the most appropriate answer.
If you pour some oil onto a floor, the friction would
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 |
Why is a ball bearing used in a cycle hub?
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.
