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Name the device which is used between th...

Name the device which is used between the hubs and axles of bicycle wheels to reduce friction

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LAKHMIR SINGH & MANJIT KAUR-FRICTION-EXERCISE
  1. Why do gymnasts apply a coarse substance to their hands ?

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

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

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

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

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

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

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

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

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  10. Name two common lubricants.

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

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

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  13. Why is the surface of a slide polished to make it smooth ?

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  14. Name the force which increases when the two surface in contact are mad...

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  15. What is the special name of frictional exerted by fluids (like air or ...

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  16. What is the name of 'special shape' which is given fo objects moving t...

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  17. Why are grooves provided in the soles of shoes ?

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  18. Why are treads made in the surface of tyres ?

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  19. Fill in the following blanks with suitable words : Friction always o...

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  20. Fill in the following blanks with suitable words : Sliding friction ...

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