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What is meant by 'rolling friction' ?...

What is meant by 'rolling friction' ?

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LAKHMIR SINGH & MANJIT KAUR-FRICTION-EXERCISE
  1. Which will cause more friction : a rough surface or a smooth surface ?...

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  2. Explain why, sliding friction is less than static friction.

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  3. What is meant by 'rolling friction' ?

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  4. Iqbal has to puch a lighter box and seema has to puch a similar heavie...

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  5. Why does a man slip when he steps on banana peel thrown on the road ?

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  6. Cae wheels often spin on icy roads. Explain why.

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  7. Explain why : a pencil will write on paper but not on glass.

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  8. Explain why : climbing a greasy pole is very difficult.

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  9. Why does a matchstick light when we strike it on a rough surface ?

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  10. Why is it difficult to light a matchstick by striking it on a smooth s...

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  11. Can two different bulbs, similar in all respect act as coherent source...

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  12. Why do brake pads of bicycles have to be replaced quite often ?

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  13. A pencil earser loses tiny pieces of rubber each time you use it. Why ...

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  14. What happen when you rub your hands vigorously for a few seconds ? Why...

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  15. Explain how, friction enables us to walk without slipping.

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  16. How does a bicycle stop when its brakes are applied ?

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  17. Explain why, the soles of our shoes wear out gradually .

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  18. Why do tyres of cars wear out gradually ?

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  19. State two advantages and two disadvantages of friction.

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  20. Explain why, sportsmen use shoes with spikes.

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