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प्रश्न
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उत्तर
When we wind a watch, the configuration of its spring is changed. The energy stored in the spring is obviously potential in nature (elastic potential to be more accurate).
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संबंधित प्रश्न
Give reasons for the following. No work is done if a man is pushing against a wall.
A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The loss in potential energy of the body,
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
Explain by an example that a body may possess energy even when it is not in motion.
Each of the following statement describes a force acting. Which force is causing work to be done?
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
Name the physical quantity associated with the 'rate of doing work'.
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
Mention whether work is done or not in the following activity.
| S. No | Activity | Work done or not done |
| 1. | Pushing the door | |
| 2. | Holding a doll | |
| 3. | Sitting in a bus | |
| 4. | Pushing a wall | |
| 5. | Digging soil |
