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Explain how, friction enables us to walk...

Explain how, friction enables us to walk without slipping.

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LAKHMIR SINGH & MANJIT KAUR-FRICTION-EXERCISE
  1. A pencil earser loses tiny pieces of rubber each time you use it. Why ...

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

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

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

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

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  6. Why do tyres of cars wear out gradually ?

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  7. State two advantages and two disadvantages of friction.

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  8. Explain why, sportsmen use shoes with spikes.

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

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  10. What is meant by lubriication ? Why is it important ?

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  11. Explain why , wheels are so useful.

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  12. Why are lubricants (oil or greses) applied to rubbing surface of machi...

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  13. Explain, how the use of oil reduces friction between two surface in co...

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  14. Why are cars, aeroplanes and rockets streamlined ?

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  15. The equation (cos p-1) x^(2) + cos p*x + sin p = 0 where x is a varia...

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  16. What are fluids ?

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  17. Name two common fluids.

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  18. Define friction. What are the facrtors affecting friction ? Explain wi...

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  19. What is the cause of friction ? Explain with the help of labelled diag...

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  20. Give a example to show that friction depends on the nature of two surf...

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