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प्रश्न
Distinguish between work and power.
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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
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.
A man lifts a mass of 10 kg from the floor to a shelf 4 meter high. If g = 10 ms-2, what is the work done?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Write an expression for work done by a force depends?
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
What do you understand by ‘potential energy’? Give three examples to illustrate your answer.
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
A ______ should act on an object.
