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Which of the following statements is cor...

Which of the following statements is correct

A

Work done by static friction is always zero

B

Work done by kinetic friction is always negative

C

The negative of t he work done by the conservative internal fores on a system equals the change in kinetic energy

D

The work dony by all the forces on a system equals the change in kinetic energy

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The correct Answer is:
D
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AAKASH INSTITUTE-WORK, ENERGY AND POWER-SECTION-B (SUBJECTIVE TYPE QUESTIONS) (ONE OPTIONS IS CORRECT)
  1. A rectangular block is mobing along a frictionless path, when it encou...

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  2. The position of a particle moving on a stringht line under rthe action...

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  3. Which of the following statements is correct

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  4. A uniform speing is kept on a horizontal frictionless floor such that ...

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  5. A block of mass m is taken from A to B under the action of a constant ...

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  6. A body of mas m starts from rest with a constant power. If velocity of...

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  7. A body is moved from rest along a straight line by a machine deliverin...

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  8. The potential energy of a particle of mass m is given by U=1/2kx^(2) ...

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  9. Figure shows a body A at the top of a frictionless hemispherical inver...

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  10. A ball suspended by a thread swings ia a vertical plane so that its ac...

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  11. A car of mass mhasan engine which can deliver constant power P.the max...

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  12. A particle of mass 0.1 kg is subjected to a force which varies with di...

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  13. A particle is moving in a verticalcircle such that the tensionin the s...

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  14. An ideal spring with spring constant k is hung from the ceiling and a ...

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  15. The bob of pendulum is project with horizontal velocity of sqrt(3gf) I...

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  16. A uniform chain of mass 4 kg and legth 2 m overhags a smooth table wit...

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  17. A particle of mass m, attached to the end of string of length l is rel...

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  18. A system consists of t wo identical masses A and B of mass m each conn...

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  19. A car starts from rest and moves on a surface in which the coefficient...

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  20. A particle falls from rest under gravity. Its potential energy with re...

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