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When do we say that work is done ?...

When do we say that work is done ?

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Work is said to be done when a force produces motion in an object.
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. Name the energy transfers which occur when : (a) an electric bell ri...

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

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  3. When do we say that work is done ?

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

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  5. Define 1 J of work.

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

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  7. What is the kinetic energy of an object ?

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  8. Write an expression for kinetic energy of an object.

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  9. The kinetic energy of an object of mass m moving with a velocity of 5 ...

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  10. What is power ?

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  11. Define 1 W of power.

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  12. A lamp consumes 1000 J of electrical energy is 10 s. What is its power...

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  13. Define avarage power.

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  14. Look at the activites listed below. Reason out whether or not work is ...

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  15. An object thrown at a certain angle to the ground moves in a curved pa...

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  16. A battery lights a bulb. Describe the energy changes involved in the p...

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  17. Certain force acting on a 20 kg mass changes its velocity from 5m//s t...

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  18. A mass of 10 kg is at a point A on a table. It is moved to a point B. ...

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  19. The potential energy of a freely falling object decreases progressivel...

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  20. What are the verious energy transformations that occur when you are ri...

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