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प्रश्न
Why is a ball bearing used in a cycle hub?
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
What is the cause of friction?
Name the three kinds of friction.
Define static friction
Arrange the following in descending order:
- static friction
- sliding friction and
- rolling friction?
Fill in the blank.
Sliding friction and rolling friction are types of .................. friction.
Tick the most appropriate answer.
Force of friction comes into play when a/an
Tick the most appropriate answer.
Friction is offered by
Answer the following in detail.
Write the characteristics of the force of friction?
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.
Assertion: Friction always opposes the motion.
Reason: Whenever one surface moves or tries to move over another surface, the force of friction starts acting on the surfaces.
