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A man walks over a rough surface. The an...

A man walks over a rough surface. The angle between the force of friction and the instantaneous velocity of the person is

A

`pi`

B

`pi/2`

C

`2pi`

D

zero

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Verified by Experts

The correct Answer is:
D
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  4. Why do we slip on a muddy road ?

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  5. State whether the following assertion is true or false : When a person...

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

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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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  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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