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Look at the activities listed below. Rea...

Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term 'work'. Food grains are getting dried in the sun.

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MODERN PUBLICATION-WORK AND ENERGY-EXERCISE
  1. Look at the activities listed below. Reason out whether or not work is...

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  2. Does work has direction associated with it?

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  3. For what value theta is work done maximum

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  4. For what value theta is work done zero?

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  5. When work is measured in J, force is measured in and displacement is ...

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  6. A person is walking on a horizontal road and carrying a briefcase. The...

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  7. Work done by centripetal force is zero . (T or F)

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  8. A coolie moves on a horizontal platform with luggage on his head. The ...

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  9. Define work. Write its formula. What is the SI unit of work? Is it a s...

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  10. Give three situations in which a force produces displacement but still...

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  11. A horizontal force acts on a body placed on a smooth horizontal table ...

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  12. A horizontal force of 20 N is required to keep a body moving in a hori...

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  13. Find the work done in lifting a 50 kg bucket a water through a vertic...

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  14. Does kinetic energy of a body depend on the direction of motion of the...

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  15. When you are climbing stairs, work done by the weight is positive. (T ...

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  16. The ratio S.I unit to C.G.S. unit of work is .

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  17. Can every force do work?

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  18. When work is done on a body then kinetic energy of the body. (increase...

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  19. A book falls freely from the table top. Is work done by some force dur...

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  20. A boy sitting in a moving car possesses kinetic energy.

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  21. If momentum of a body is doubled, the kinetic energy becomes times.

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