Advertisements
Advertisements
प्रश्न
Differentiate 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
When does a force do work?
A satellite revolves around the earth in a circular orbit. What is the work done by the force of gravity? Give reason.
What physical quantity does the electron volt (eV) measure? How is it related to the S.I. unit of that quality?
A body of mass m is moving with a uniform velocity u. A force is applied on the body due to which its velocity changes from u to v. How much work is being done by the force?
What is a centripetal force?
A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes.
How much work each does? Take density of water = 103 kg m-3 and g = 9.8 N kg-1.
A bullet fired against a window glass pane makes a hole in it without any cracks while a stone striking the same glass pane smashes it; explain with reason.
What do you understand by work? Is work a scalar or a vector quantity?
State the condition when the work done by the force is positive
Derive a relation between the S.I. and C.G.S. unit of force.
