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Explain how friction helps in walking....

Explain how friction helps in walking.

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MBD-LAWS OF MOTION-EXAMPLE
  1. Why are tyres made circular?

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  2. Can we get off a frictionless horizontal surface by jumping?

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  3. Explain how friction helps in walking.

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  4. It is difficult to move a cycle along a road with its brakes on. Why?

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

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  6. Name the two types of dynamic (kinetic) friction.

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  7. What is the cause of friction? In which case is it maximum?

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  8. How does coefficient of friction is altered when the weight of body is...

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  9. Friction is a self- adjusting force. Is it correct?

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  10. How friction is reduced in fast moving vehicle?

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  11. Automobile tyres have generally irregular projections over their surfa...

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  12. Why are rockets given conical shape?

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  13. What is the angular velocity of the hour hand of a clock?

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  14. Why skidding takes place on a rainy day along a curved path?

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  15. Give an example when a body moving with unifrom speed has acceleration...

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  16. Name the physical quantities which remains constant for a particle mov...

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  17. What provides the centripetal force to a caar taking turn on a level r...

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  18. Define centrifugal force.

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  19. What provides the centripetal force to a satellite revolving around th...

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  20. What is the relation between coefficient of friction and angle of repo...

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