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State whether the following assertion is...

State whether the following assertion is true or false : When a person walks on a rough surface, the frictional force exerted by the surface on the person is opposite to the direction of his motion.

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False, when a person walks on a rough surface the man exerts a backward frictional force on the surface. It is the third law force exerted by the road on the person that causes the motion.
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MBD PUBLICATION-FRICTION-QUISTION BANK
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  3. State whether the following assertion is true or false : When a person...

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

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

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

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  7. It is easier to than push.

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  8. How does a lubricant help in decreasing friction ?

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

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

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  12. Write down the dimensional formula of force of friction

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

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

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

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

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  17. What is static friction ?

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  18. What is kinetic friction ?

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

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  20. Why surface of tyres are made rough.

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