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CBSE Class 9 Answered

How is potential energy affected when work done by a body and when work done on a body
Asked by saradamahapatra9999 | 19 Feb, 2019, 10:43: AM
answered-by-expert Expert Answer
The energy of the body due to its position or change in shape is known as potential energy. 
When there is a change in the shape of an object we can say that the work is done on the body.
For example: Stretching rubber band, stretching or compressing the spring etc. 
Thus, in these cases, the work is stored in the deformed body. 
 
When this deforming force is released the object regains its original shape and size. So here, we can say that the work is done by the body. For example, when we give a key to a toy car, the spring inside it is compressed and the work is stored in the form of potential energy but when the key is released the potential energy stored in the spring gets converted to kinetic energy and hence the car moves. Hence, the work is done by the body. 
Answered by Shiwani Sawant | 19 Feb, 2019, 12:22: PM

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