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When we try to push a heavy box kept on ...

When we try to push a heavy box kept on ground, it does not move at all. Which force is preventing this box to move forward ? Where does this force act ?

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LAKHMIR SINGH & MANJIT KAUR-FRICTION-EXERCISE
  1. Fill in the following blanks with suitable words : Object which can ...

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  2. Fill in the following blanks with suitable words : The shape of an a...

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  3. When we try to push a heavy box kept on ground, it does not move at al...

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  4. Suppose your writing table (or desk) is tilted a little. A book kept o...

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  5. Which will cause more friction : a rough surface or a smooth surface ?...

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

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  7. What is meant by 'rolling friction' ?

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

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

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

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

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

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

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

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

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

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

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

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

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

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