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Work done by a force on an object is zer...

Work done by a force on an object is zero, if

A

the force is always perpendicular to its acceleration

B

the object is stationary but the point of application of the force moves on the object

C

the force is always perpendicular to its velocity

D

the object moves in such a way that the point of application of the force remain fixed

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The correct Answer is:
B, C
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FIITJEE-WORK, ENERGY AND POWER -ASSIGNMENT PROBLEMS ( OBJECTIVE) (LEVEL-II)
  1. The potential energy U for a force field vec (F) is such that U=-kxy w...

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  2. A sledge moving over a smooth horizontal surface of ice at a velocity ...

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  3. Suppose a car is molded as a cylinder moving on earth at a speed v. If...

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  4. For stable equilibrium, which of the following is/are true ?

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  5. A man is running with a constant acceleration on a plank which is plac...

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  6. A particle of mass 5 kg moving in the x-y plane has its potential ene...

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  7. A particle is moving in a conservative force field from point A to poi...

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  8. A particle is taken from point A to point B under the influence of a f...

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  9. Select the correct alternative(s).

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  10. Work done by a force on an object is zero, if

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  11. The sum of all the external forces on a system of particles is zero. W...

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  12. Displacement time graph of a particle moving in a straight line is as ...

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  13. One end of a light spring of spring constant k is fixed to a wall and ...

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  14. A particle moves in a straight line with constant acceleration under ...

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  15. In a projectile motion, power of the gravitational force

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  16. A weightless rigid rod AB of length / connects two equal masses m one ...

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  17. Work is

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  18. Choose the correct statement for conservative force.

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  19. Which of the following is/are true regarding work ?

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