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Mark out the correct statement(s)....

Mark out the correct statement(s).

A

Total work done by internal forces on a system is always zero

B

Total work done by internal forces on a system may sometimes be zero

C

Total work done by friction can never be zero

D

Total work done by friction is always zero

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Work done by friction mayt be positive, negative and zero. Work done by conservative, internal forces may be zero in a round trip but it is non-zero for non-conservative internal forces.
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DC PANDEY ENGLISH-WORK, ENERGY AND POWER-EXERCISES(TAKING IT TOGETHER)
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  2. A stone of mass 2 kg is projected upwards with KE of 98 J. The height ...

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  3. Mark out the correct statement(s).

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  4. A vehicle needs an engine of 7500 W to keep it moving with a constant ...

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  6. An object of mass m, initially at rest under the action of a constant ...

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  7. A particle at rest on a frictionless table is acted upon by a horizont...

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  8. The energy required to accelerate a car from 10 m/s to 20 m / s is how...

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  9. A force F= -khati+xhatj where k is a positive constant, acts on a prar...

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  10. Given that the displacement of the body in meter is a function of time...

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  11. A block is attached to a spring as shown and very-very gradually lower...

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  12. A uniform chain of length L and mass M is lying on a smooth table and ...

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  13. An object of mass m is tied to a string of length L and a variable for...

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

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  15. Three particles A, B and C are thrown from the top of a tower with the...

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  16. The force required to stretch a spring varies with the distance a show...

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  17. Kinetic energy of a particle moving in a straight line varies with tim...

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  18. A particle is released from height H. At certain height from the groun...

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  19. Power applied to a particle varices with time as P =(3t^(2)-2t + 1) wa...

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  20. A motor drives a body along a straight line with a constant force. The...

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