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Give three situations in which a force p...

Give three situations in which a force produces displacement but still the work done by the force is zero.

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MODERN PUBLICATION-WORK AND ENERGY-EXERCISE
  1. A coolie moves on a horizontal platform with luggage on his head. The ...

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

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

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

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

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

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

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

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

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  10. Can every force do work?

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

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

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

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

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  15. Is energy a scalar or a vector quantity? Why?

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  16. What are the various forms of energy? Give some examples of each.

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  17. Define Kinetic energy. Give one example.

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  18. A boy of mass 18 kg is running with a speed of 12 km/h. Find the kinet...

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  19. Given that the kinetic energy of an object is 100 J. If the mass of ob...

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  20. A stationary football is kicked by a player such that it attains a spe...

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