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Which force is responsible for the weari...

Which force is responsible for the wearing out of car tyres ?

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LAKHMIR SINGH & MANJIT KAUR-FRICTION-EXERCISE
  1. Why is it more difficult to walk properly on a well-polished floor ?

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  2. Prove that the curves y(1) = f (x) (f(x) gt 0) and y(2) = f(x) sin x, ...

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  3. Which force is responsible for the wearing out of car tyres ?

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  4. What prevents you from slipping every time you take a step forward ?

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  5. Name the force which helps things to move and stop.

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  6. What enables us to fix nails in a wall and knots to be tied ?

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  7. What makes the steps of foot over-bridges and Railways Station to wear...

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  8. What is done to increase friction between the tyres and road ?

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  9. Why do gymnasts apply a coarse substance to their hands ?

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  10. Why do kabaddi players rub their hands with dry soil ?

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  11. Name the device which is used between the hubs and axles of bicycle wh...

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  12. What is the purpose of using ball bearings in machines ?

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  13. Name any two machines in which bearings are used.

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  14. The ovule is attached to the placenta by a stalk called ………… .

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  15. Name one example from everyday life where wheels (or rollers) are used...

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  16. Why does oiling the axles of bicycle make the bicycle move more easily...

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  17. State one way in which the friction between wheel and its axle can be ...

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  18. Name two common lubricants.

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  19. Why do we sprinkle fine powder on carrom board ?

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  20. Which force gets reduced when the two surface in contact are polished ...

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