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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
Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
Give an example to illustrate the existence of the force of friction.
State two factors which directly affect the force of friction.
Name the three kinds of friction.
Arrange the following in descending order:
- static friction
- sliding friction and
- rolling friction?
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
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 helps us to grip the objects in our hand.
A moving body comes to rest due to friction alone.
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
