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CBSE Class 9 Answered

if work AND ENERGY ARE TWO SAME PARAMETER MEASURIN QUANTITY THAN WHY TWO TERMS ARE DEFINED.....
AND IS IT POSSIBLE THAT TOTAL ENERGY OF SYSTEM LESS THAN POTENTIOL ENERGY.
Asked by PRAMOD | 01 Oct, 2015, 11:54: AM
answered-by-expert Expert Answer
Although the unit of work and energy is same, these two are different entities in terms of their physical meanings.
 
Energy is the ability of an object to do work. If an object has energy it can do work. It does not mean that the object has energy and it will do a certain work.
 
Similarly, work is the change in energy. If an object has certain amount of energy and it does a certain work, then some part of the energy will still remain in the object.
 
Example: You ate some food, and you gained certain amount of energy from it. Then, the maximum work you can do is equal to the energy. 
In a similar sense, if you did some work to lift an object, then some energy is still left in your body. This change in energy is equal to the work that you did to do that task.
 
So, both quantities are different physically.
Answered by Romal Bhansali | 01 Oct, 2015, 12:29: PM

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