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प्रश्न
Why is a ball bearing used in a cycle hub?
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उत्तर
The rolling friction is smaller than sliding friction, sliding is replaced by rolling with the usage of ball bearings. So lead shots are used in the bearing of a cycle hub.
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संबंधित प्रश्न
Friction depends on the ______ of surfaces.
Give three examples to illustrate that friction is a necessary evil.
Define rolling friction
Arrange the following in descending order:
- static friction
- sliding friction and
- rolling friction?
Tick the most appropriate answer.
Friction for an object can be reduced by
Tick the most appropriate answer.
If you pour some oil onto a floor, the friction would
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.
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 |
How do you feel when you touch a nail immediately after it is hammered into a wooden plank? Why?
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
