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)` |
संबंधित प्रश्न
A man having a box on his head, climbs up a slope and another man having an identical box walks the same distance on a levelled road.
Who does more work against the force of gravity and why?
State two factors on which power spent by a source depends. Explain your answer with examples.
An ox can apply a maximum force of 1000 N. It is taking part in a cart race and is able to pull the cart at a constant speed of 30 ms-1 while making its best effort. Calculate the power developed by the ox.
State the factors on which moment of force about a point depends.
What do you understand by the clockwise and anti clockwise moment of force?
Give the units of couple.
State two conditions for work to be done.
A coolie carrying a load on his head and moving on a frictionless horizontal platform does no work. Explain the reason why.
State the C.G.S. unit of work. How it is related to its S.I. unit?
A force of 1 kgf displaces a body by a distance of 10 cm
(i) in direction of force,
(ii) normal to the force
(iii) at an angle of 60° to the direction of the force.
Calculate the amount of work done in each case. (Take: g = 9.8 ms−2 )
