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प्रश्न
What do you understand by 'potential energy' and 'Kinetic energy'? Give three examples of each to illustrate your answer.
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उत्तर
The energy possessed by a body by virtue of its position, shape or change of configuration is called potential energy.
Examples of potential energy:
(i) Water stored at a height in a reservoir.
(ii) A stretched spring.
(iii) A bent bow.
The energy possessed by a body by virtue of its motion is called kinetic energy.
Examples of kinetic energy:
(i) Air in motion has kinetic energy.
(ii) A swinging pendulum.
(iii) Moving hands of a clock.
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संबंधित प्रश्न
Define 1 J of work.
A coolie does no work against the force of gravity while carrying a luggage on a road.
The S.I. unit of work is
When does a force perform work?
Define the term energy.
What are the two kinds of mechanical energy?
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
A coolie, with a load of 30 kg on his head, walks on the platform. If he walks a distance of 60 m, what is the work done by him?
What is work?
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
