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प्रश्न
Distinguish between work and power.
उत्तर १
Work is said to be done only when the applied force on a body makes the body move but power is the rate of doing work.
The SI unit of work is 'joules' and that of power is 'watt'.
उत्तर २
Work does not depend on time, while the power depends on time.
Power is the work done in unit time.
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संबंधित प्रश्न
A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (see the given figure). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
Define work.
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 body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The loss in potential energy of the body,
A boy weighing 25 kgf climbs up from the first floor at height 3 m above the ground to the third floor at height 9m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg -1)
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
What are the quantities on which the amount of work done depends? How are they related to work?
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?
What is meant by a translational motion? Give one example.
What do you mean by a kilo joule?
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
Define energy and state the unit of energy and the law of conservation of energy.
Can two agents, doing the same work, have different power?
If a ball is dropped on the sloping roof of a house, it acquires ______ and falls on the ground. That is the transformation of ______ energy into ______ energy takes place.
(kinetic, potential, motion)
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
