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Why are vehicles provided with wheels an...

Why are vehicles provided with wheels and- ball bearing ?

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The is due to the fact that the rolling friction is much smaller than the sliding friction.
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  1. State whether the following assertion is true or false : When a person...

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  2. Is a large brake on a bicycle wheel more effective than a small one ?

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  3. Why are vehicles provided with wheels and- ball bearing ?

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  4. Comment on the statement ‘friction is necessary evil’.

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  5. It is easier to than push.

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  6. How does a lubricant help in decreasing friction ?

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  7. To slide a heavy box, we generally left it a bit to place a metallic p...

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  8. Why has a horse to pull a cart harder during the first few steps of hi...

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  9. How do we save petrol when the tyres of the motor cycle are fully infl...

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  10. Write down the dimensional formula of force of friction

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  11. Write down the mathematical expression for coefficient of static frict...

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  12. Write down the mathematical expression for coefficient of kinetic fric...

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  13. Write down the mathematical expression for coefficient of static frict...

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  14. What is the slope of the graph attained by plotting of dynamic frictio...

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  15. What is static friction ?

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  16. What is kinetic friction ?

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  17. Discuss the statement “friction is a necessary evil”.

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  18. Why surface of tyres are made rough.

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  19. What is maximum value of coefficient static friction ?

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  20. What is nature of surface if coefficient friction is zero.

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