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Which of the following energy change inv...

Which of the following energy change involves frictional force?

A

chemical energy to heat energy

B

kinetic energy to heat energy

C

potential energy to sound energy

D

chemical energy to kinetic energy

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The correct Answer is:
B
NA
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. When a body falls freely towards the earth, then its total energy

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  2. Which one of the following is not the unit of energy?

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  3. Which of the following energy change involves frictional force?

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  4. An electric motor raises a load of 0.2 kg, at a constant speed, throug...

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  5. An object is falling freely from a height x. After it has fallen a hei...

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  6. COMMERCIAL UNIT OF ENERGY

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  7. How much energy does a 100W electric bulb transfer in 1 minute?

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  8. The device which converts mechanical energy into energy which runs our...

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  9. A microphone converts

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  10. The following data was obtained for a body of mass 1 kg dropped from a...

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  11. A ball falls to the ground as shown below : (a) What is the kinet...

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  12. In an experiment to measure his power, a student records the time take...

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  13. In loading a truck, a man lifts boxes of 100 N each through a height o...

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  14. Name the energy transfers which occur when : (a) an electric bell ri...

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  15. A force of 7 N acts on an object. The displacement is, say 8 m, in the...

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  16. When do we say that work is done ?

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  17. Write an expression for the work done when a force is acting on an obj...

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  18. Define 1 J of work.

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  19. A pair of bullocks exerts a force of 140 N on a plough. The field bei...

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  20. What is the kinetic energy of an object ?

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