Advertisements
Advertisements
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.
Advertisements
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.
संबंधित प्रश्न
The S.I. unit of energy is .............
When does a force perform work?
What are the two kinds of mechanical energy?
Give reasons for the following. No work is done if a man is pushing against a wall.
What are the quantities on which the amount of work done depends? How are they related to work?
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
State larger units of power.
What should be the characteristic of a source of energy?
How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m3 of water from a depth of 15m. [Take g = 10 N kg−1]
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
