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Define work - energy theorem....

Define work - energy theorem.

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Work is said to be done by the force when the force applied on a body displaces it.
Energy: Energy is defined as the ability to do work.
Power: The rate of work done is called power.
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Assertion : When Air is blow on a plastic cover, lying on the floor. If flies to a particular height in different directions. Also It's energy at different positions keep changing. Reason : Work done by the force on the body changes the kinetic energy of the body. This is called Work - Energy Theorem. i.e., W = Delta K.E.

FULL MARKS-WORK, ENERGY AND POWER-Additional Question Solved (II. Short Answer Questions)
  1. Define work - energy theorem.

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  2. Discuss the possibilities of work done to be zero.

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  3. Derive the relation between momentum and kinetic energy.

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  4. How can an object move with zero acceleration (constant velocity) when...

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  5. Why should the object be moved at constant velocity when we define pot...

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  6. Derive an expression for potential energy near the surface of the eart...

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  7. Discuss the force - displacement graph for a spring.

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  8. Discuss the force - displacement graph for a spring.

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  9. Define unit of power

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  10. Define power, average power, instantaneous power.

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  11. Define elastic and inelastic collision.

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  12. What will happen to the potentail energy of the system ? If (i) Two ...

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  13. Write the differences between conservative and Non - conscrvative forc...

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  14. A light and heavy body have equal momentum, which has greater K.E?

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  15. The momentum of the body is doubled, what % does its K.E. change ?

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  16. A body is moving along a circular path . How much work is done by the ...

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  17. Which spring has greater value of spring constant-a hard spring or a d...

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  18. Two bodies stick together after collision. What types of collision is ...

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  19. State the condition under which a force does not work.

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  20. How will the momentum of a body change if its K.E. is doubled ?

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