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State the condition under which a force ...

State the condition under which a force does not work.

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(i) Displacement is zero.
(ii) Displacement is perpendicular to the force.
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PREMIERS PUBLISHERS-WORK, ENERGY AND POWER -VERY SHORT ANSWER QUESTIONS
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  2. State the condition under which a force does not work.

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  6. Define energy and write its unit and dimension.

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  8. Potential energy

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  9. What is meant by kinetic energy?

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  10. How many joules make up one erg?

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

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

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  13. Can a body have momentum without energy?

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

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

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

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  17. Define watt.

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

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

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

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