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Iqbal has to puch a lighter box and seem...

Iqbal has to puch a lighter box and seema has to puch a similar heavier box on the same floor . Who will have to apply a larger force and why ?

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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?

Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Iqbal will have to apply a larger force. State true or false with reasons.

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A large box, placed on the ground, has to be shifted up to a wall, as shown in the given figure. Three boys push the box together. They have to apply a large amount of force to move the box. The motion of the box is opposed by the frictional force between the box and the ground. If wheels were present below the box, then they would have to apply

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LAKHMIR SINGH & MANJIT KAUR-FRICTION-EXERCISE
  1. Explain why, sliding friction is less than static friction.

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  2. What is meant by 'rolling friction' ?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  17. Why do tyres of cars wear out gradually ?

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  18. State two advantages and two disadvantages of friction.

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  19. Explain why, sportsmen use shoes with spikes.

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  20. How will you reduce friction between those machine parts which rub ag...

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