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Why are lubricants (oil or greses) appli...

Why are lubricants (oil or greses) applied to rubbing surface of machines ?

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LAKHMIR SINGH & MANJIT KAUR-FRICTION-EXERCISE
  1. What is meant by lubriication ? Why is it important ?

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  2. Explain why , wheels are so useful.

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

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

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  5. Why are cars, aeroplanes and rockets streamlined ?

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

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  7. What are fluids ?

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  8. Name two common fluids.

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

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

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

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  12. What is the difference between static friction and sliding friction ? ...

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  13. How can a very heavy machine be moved conveniently from one place to a...

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  14. What is drag ?

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  15. The coordinates of A and B are

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  16. How can you reduce the drag on something moving through the air ?

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  17. What is meant by 'streamlined shape' ?

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  18. The fast moving vehicles are given streamline shape . Why ?

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  19. A boy runs his toy can on dry marble floor, wet marble floor, newspape...

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  20. Four children were asked to arrange forces due to rolling, static and ...

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