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Work done by a body against friction alw...

Work done by a body against friction always results in a loss of its kinetic/potential energy .

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Kinetic energy decreases because friction does its work against motion .
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KUMAR PRAKASHAN-WORK, ENERGY AND POWER -SECTION - B Numericals (Numerical From Textual Exercise)
  1. In figure (i) the man walks 2 m carrying a mass of 15 kg on his hands...

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  2. When a conservative force does positive work on a body , the potential...

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  3. Work done by a body against friction always results in a loss of its k...

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  4. The rate of change of total momentum of a many -particle system is pro...

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  5. In an inelastic collision of two bodies, the quantities which do not c...

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  6. In an elastic collision of two bodies , the momentum and energy of eac...

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  7. Total energy of a system is always conserved , no matter what internal...

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  8. Work done in the motion of a body over a closed loop is zero for ever...

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  9. In an elastic collision , the final kinetic energy is always less than...

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  10. In an elastic collision of two bodies , the momentum and energy of eac...

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  11. Explain the total linear momentum is conserved in an elastic collis...

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  12. Practically, if 10kJ of energy is supplied to a device, how much energ...

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  13. If the potential energy of two billiard balls depends only on the sepa...

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  14. A body is initially at rest . It undergoes one - dimensional motion w...

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  15. A body is moving indirectionally under the influence of a source of co...

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  16. A body constrained to move along the z -axis of a coordinate system is...

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  17. An electron and a proton are detected in a cosmic ray experiment , the...

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  18. A rain drop of radius 2 mm falls from a height of 500 m above the grou...

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  19. A molecule in a gas container hits a horizontal wall with speed 200 ms...

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  20. A pump on the ground floor of a building can pump up water tofill a ta...

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