Advertisements
Advertisements
प्रश्न
Differentiate between work and power.
Give two differences between work and power.
Advertisements
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)` |
APPEARS IN
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?
How is the unit horsepower related to the S.I. unit of power?
What do you understand by the clockwise and anti clockwise moment of force?
State the condition when a force produces
(i) linear motion.
(ii) rotational motion, in a body.
In the following case write yes, if the work is being done and no if no work is being done.
A man trying to push a wall.
Justify the statement. “Power can be expressed as the product of force and velocity.”
A machine raises a load of 750 N through a height of 16 m in 5 seconds. Calculate the power at which the machine works.
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person walks on a levelled road.
A boy weighing 50 kgf climbs up from the first floor at a height of 3 m above the ground to the third floor at a height of 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg-1).
