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प्रश्न
Give three examples to illustrate that friction is a necessary evil.
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उत्तर
The examples to illustrate that friction is a necessary evil are:
- If friction were absent, we would not be able to walk.
- Friction is necessary to burn a matchstick.
- It is due to friction that we can write on board by chalk.
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संबंधित प्रश्न
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
Give examples to show that friction is both a friend and a foe.
Define rolling friction
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
Tick the most appropriate answer.
Friction is offered by
Fill in the blank.
Smoother the surface, ................. is the frictional force offered by it.
Fill in the blank.
Friction is a type of .................
Why is a ball bearing used in a cycle hub?
Explain how friction can be minimized.
Complete the analogy.
Knot in a thread : ______ friction :: Ball bearing : ______ friction.
