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Explain why, wooden (or concrete ) sleep...

Explain why, wooden (or concrete ) sleeps are kept below the railway line .

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    LAKHMIR SINGH & MANJIT KAUR|Exercise EXERCISE|115 Videos

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LAKHMIR SINGH & MANJIT KAUR-FORCE AND PRESSURE.-EXERCISE
  1. Name the type of forces involved in the following : e) A moving boat...

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  2. Why does a sharp knife cut object more effectively than a blunt knife ...

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  3. Explain why, wooden (or concrete ) sleeps are kept below the railway l...

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  4. Explain why a wide steel belt is provided over the wheels of an army t...

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  5. Explain why ,the tip of a sewing neddis is sharp.

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  6. Explain why,snow shoes stop you from sinking into snow.

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  7. Explain why, when a person stands on a cushion, the depression is much...

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  8. Explain why, porters place a thick round piece of cloth on their heads...

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  9. Give one practical application of magnetic force.

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  10. What is meant by a contact force ? Explain with the help of an example...

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

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  12. Define frictional force ( or friction) .

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

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

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

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

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

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

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

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

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