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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

How is work related to energy? - Physics

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प्रश्न

How is work related to energy?

संक्षेप में उत्तर

उत्तर

RELATION BETWEEN WORK AND ENERGY: “Energy is the capacity of doing work” Every form of energy → is work.
i.e. work done on the body is stored in the form of energy. Energy is spent when a body does work. Thus to do more amount of work-more energy is needed.

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अध्याय 4: Energy - Short/Long Answer questions [पृष्ठ ७७]

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सेलिना Concise Physics [English] Class 8 ICSE
अध्याय 4 Energy
Short/Long Answer questions | Q 13 | पृष्ठ ७७

संबंधित प्रश्न

Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.


A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?


The S.I. unit of energy is .............


Write the expression for work done by a force.


When is work said to be done by a force?


A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:

  1. the work done, and
  2. the power developed by them. Take g = 10 N kg-1.

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


A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :


Give two examples of couple action in our daily life.


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


On what factors does the work done by a force depend?


Complete the following sentences:

Kilowatt is the unit of ....... and kWh is the unit of


Can work done be zero even if force acts on the body?


Define potential energy.

A cricket ball is thrown up from the earth's surface. What happens to its P.E.
(a)    during the motion
(b)    at the highest point?


A horse exerts a pull on a cart of 300 N so that the horse-cart system moves with a uniform speed 18 km/h on a level road. Calculate the power developed by the horse in watt and also find its equivalent in horse power.

How fast should a boy weighting 30 kg run so that his kinetic energy is 375 joule?


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


Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

A green plant is carrying out photosynthesis.


Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

Food grains are getting dried in the sun.


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