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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.
संबंधित प्रश्न
Define 1 joule of energy.
.A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s. Compare:
(i) the work done, and
(ii) the power developed by them.
State the law of conservation of energy.
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
Is work done a scalar or a vector physical quantity?
What is the ratio of SI units to CGS units of 'work'?
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
Is power a scalar or a vector quantity?
