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What Do You Understand by the Term Energy? is Energy a Scalar Or Vector? How is the Energy Possessed by a Body Measured? - Physics

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प्रश्न

What do you understand by the term energy? Is energy a scalar or vector? How is the energy possessed by a body measured?

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उत्तर

Energy is defined as the capacity of a body to do work. Energy is a scalar quantity. The energy possessed by a body is measured by the amount of work done by a body while changing its state of rest or state of motion.

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पाठ 1: Force, Work, Power and Energy - Short Answers

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आईसीएसई Physics [English] Class 10
पाठ 1 Force, Work, Power and Energy
Short Answers | Q 63

संबंधित प्रश्‍न

When is work said to be done by a force?


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, 


Fill in the blank with suitable word : 
The work done on a body moving in a circular path is __________


A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.


A uniform circular motion is an accelerated motion. Justify it.


Explain the difference between a uniform linear motion and a uniform circular motion.


What is the SI unit of work?


What is the work done by the gravitational force of the earth on a satellite revolving around the earth?

What is the work done against gravity when a body is moved horizontally along a frictionless surface?


Distinguish between work and power.


A body of mass 2 kg is moving with a speed of 20 ms-1. What is its K.E.?

Name the type of energy possessed by a
(i) stretched catapult        (ii) hot iron
(iii) wound up clock


An object is dropped from a height H. when is its
(i)    P.E. maximum,
(ii)    K.E. maximum,
(iii)    P.E. = K.E.?


Write the S.I. units of power.

What is meant by the principle of moments?

Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction


(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.


A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate:  the speed of the body.


In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?


A force of F = (5y + 20) `hat"j"` N acts on a particle. The work done by this force when the particle is moved from y = 0 m to y = 10 m is ______ J.


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