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प्रश्न
Differentiate between work and power.
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उत्तर
| Work | Power | |
| 1. | The work done by a force is equal to the product of the force and the displacement in the direction of the force. | The power of a source is the rate of which it does work by it. |
| 2. | The work done does not depend on time. | Power spent depends on the time in which work is done. |
| 3. | S.I unit of work is the joule (J). | S.I unit of power is watt (W) |
| 4. | W = F × S | P = `w/t` |
| 5. | 1J = 1N × 1m | 1 Watt = `(1J)/(1Sec)` |
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संबंधित प्रश्न
A stone of mass m is rotated in a circular path with a uniform speed by tying a strong string with the help of your hand. Answer the following questions
1) Is the stone moving with a uniform or variable speed?
2) Is the stone moving with a uniform acceleration? In which direction does the acceleration act?
3) What kind of force acts on the hand and state its direction?
State the condition when the work done by a force is positive. Explain with the help of examples.
When a body moves in a circular path, how much work is done by the body? Give reason.
(Hint: The body is acted upon by the centripetal force.)
State two factors on which power spent by a source depends. Explain your answer with examples.
What do you understand by the clockwise and anti clockwise moment of force?
State the principle of moments.
An engine does 54,000 J of work by exerting a force of 6000 N on it. What is the displacement in the direction of the force?
1 kWh = ______ J.
Relate 1 KWh (kilowatt hour) with joule.
