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प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
An engine is pulling a train.
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उत्तर
- An engine applies force to pull the train. This allows the train to move in the direction of force.
- Therefore, there is a displacement in the train in the same direction.
- Hence, work is done by the engine on the train.
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संबंधित प्रश्न
Define 1 joule of energy.
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Complete the following sentences:
The SI unit of work is ....... and of power is .......
(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
Fill in the boxe to show the corresponding energy transformation.
Is power a scalar or a vector quantity?
Can two agents, doing the same work, have different power?
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 |
A force can cause an object to change its ______.
