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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
Define sliding friction
A body needs a force F1 just to start moving on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is
- the static friction
- sliding friction and
- rolling friction? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.
Fill in the blank.
More the roughness of a surface, greater is the ........................
Tick the most appropriate answer.
Friction is offered by
Fill in the blank.
Friction is a type of .................
Fill in the blank.
Bicycles use ...................... to reduce friction between the pedals and the crank
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 |
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
Explain how friction can be minimized.
