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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.
Fill in the blank.
We use ball bearings to .................. the friction.
What is the cause of friction?
List three ways of reducing friction.
Answer the following in a word or two or in a sentence.
Which type of force acts on a string pulled from both ends?
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
Fill in the blank.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
Tick the most appropriate answer.
Force of friction comes into play when a/an
Fill in the blank.
Smoother the surface, ................. is the frictional force offered by it.
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
