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When is work done by a force zero ?...

When is work done by a force zero ?

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Work done by a force is zero if the direction of force and displacement are perpenddicular to each other or if the displacement is zero.
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PRADEEP-WORK AND ENERGY-Very short Answer Question
  1. When is work done by a force positive ?

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  2. When is work done by a force negative ?

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  3. When is work done by a force zero ?

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  4. Is work a scalar quantity or a vector quantity ?

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  5. Is a person doing any work by holding a suitcase ?

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  6. what are the units of work and energy ?

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  7. Is energy a vector quantity ?

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  8. Name two forms of mechanical energy.

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  9. By now much will the kinetic energy of a body increase if its speed is...

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  10. A body is thrown vertically upwards ? Its velocity goes on decreasing...

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  11. Flowing water can rotate a turbine. What type of energy is used up by ...

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  12. What type of energy is possessed by a cricket ball just before being c...

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  13. Explain by a an example that a body may possess energy when it is not ...

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  14. How is energy stored in a clock ?

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  15. Give an example where potential energy is acquired by a body due to ch...

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  16. Name the type of energy possessed by a reised hammer.

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  17. Name the type of energy possessed by a stretched rabber band.

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  18. A cell converts one form of energy into another. Name the two forms.

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  19. Name the device which converts electrical energy into mechanical energ...

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  20. Name a mechine that transforms muscular energy into useful mechanical ...

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