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Define frictional force ( or friction) ....

Define frictional force ( or friction) .

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LAKHMIR SINGH & MANJIT KAUR-FORCE AND PRESSURE.-EXERCISE
  1. What is meant by a contact force ? Explain with the help of an example...

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  2. What is meant by a non - contact force ? Explain with the help of an e...

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  3. Define frictional force ( or friction) .

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  4. Explain why, frictional force is said to be a contact force.

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  5. Explain why magnetic force is said to be a non - contact force.

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  6. Define pressure. What is the relation between pressure , force and are...

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  7. Explain why, school bags are provided with wide straps to carry them.

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  8. What is meant by atmospheric pressure? What is the cause of atmospheri...

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  9. Why are our bodies not crushed by the large pressure exerted by the at...

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  10. Explain why , atmospheric pressure decreases as we go higher up above ...

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  11. How does the pressure of a liquid depend on its depth ? Draw a lebelle...

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  12. Explain why, the walls of a dam are thicker near the bottom than at th...

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  13. Which of the following is not an example of muscular force ?

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  14. Which of the following is not an example of the force of gravity ?

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  15. When we press the bulb of a dropper with its nozzle kept in water, air...

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  16. A rectangular wooden block has length, breadth and height of 50 cm, 25...

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  17. Which of the following are contact forces ? A. Friction B. Gravitat...

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  18. If we release a magnet held in our hand, it falls to the ground. The f...

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  19. Which of the following force is utillised in reducing air pollution by...

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  20. The same force F acts on four different objects having the areas given...

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