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A 50 gm box is placed on an inclined pla...

A 50 gm box is placed on an inclined plane making an angle of `30^@` with the horizontal so that a gentle tapping causes the sliding of the box. Calculate the coefficient of static friction for the surfaces of the box and the inclined plane in contact.

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

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

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  9. It is easier to than push.

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  10. How does a lubricant help in decreasing friction ?

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

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

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

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  14. Write down the dimensional formula of force of friction

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

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

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

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

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  19. What is static friction ?

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  20. What is kinetic friction ?

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

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