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प्रश्न
When do we say that work is done?
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उत्तर
- When a force operates on an object and causes it to be displaced from its original location, it produces work.
- A force acts on the body.
- There is a displacement of the body caused by the applied force along the direction of the applied force.
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संबंधित प्रश्न
A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
A coolie does no work against the force of gravity while carrying a luggage on a road.
Define 1 joule of energy.
1 J = ______ calorie.
State the law of conservation of energy.
The work done on an object does not depend on ______.
List any six forms of energy and write a short note on each of them.
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
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 |
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A wind-mill is lifting water from a well.
