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When a work is said to be done? Give som...

When a work is said to be done? Give some example.

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Work is said to be done by the force when the force applied on a body displaces it. Eg: Horse pulls a cart, engine pulls a train.
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PREMIERS PUBLISHERS-WORK, ENERGY AND POWER -VERY SHORT ANSWER QUESTIONS
  1. Can you associate potential energy with non-conservative force?

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  2. A rocket explodes in mid air. How does this affect its total momentum?

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  3. Define watt.

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  4. When a work is said to be done? Give some example.

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  5. State the condition under which a force does not work.

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  6. What is the work done by the person in holding 15 kg suitcase while wa...

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  7. What is the work done by the force of tension in the string of simple ...

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  8. What physical quantity does the area under the force-displacement curv...

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  9. Define energy and write its unit and dimension.

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  10. A man run a distance on the level road. The same man ascends up a hill...

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  11. What is meant by the term potential energy ? Give its two examples.

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  12. What is meant by kinetic energy?

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  13. How many joules make up one erg?

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  14. Which physical quantities is / are conserved during elastic and inelas...

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  15. A body is moving at constant speed over a frictionless surface. What i...

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  16. Can a body have momentum without energy?

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  17. Does the work done in raising a suitcase on to platform depend upon ho...

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  18. Can you associate potential energy with non-conservative force?

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  19. A rocket explodes in mid air. How does this affect its total momentum?

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  20. Define watt.

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