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What is done to increase friction betwee...

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

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To increase friction between the tyres and road, tyres are treaded that is oblique inscisions are made to increase the surface area thus making it rough. This way a greater rate of friction is achieved.
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A car is taking turn on a circular path of radius R. If the coefficient of friction between the tyres and road is mu , the maximum velocity for no slipping is

A bend in a level road has a radius of 100 m Find the maximum speed which a car turning this bend may have without skidding if coefficient of friction between the tyres and the road is 0 .8 S .

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LAKHMIR SINGH & MANJIT KAUR-FRICTION-EXERCISE
  1. What enables us to fix nails in a wall and knots to be tied ?

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

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

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

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

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

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

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

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

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

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

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

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  13. Name two common lubricants.

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

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

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

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

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

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

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

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