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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

How is work related to energy? - Physics

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प्रश्न

How is work related to energy?

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

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

संबंधित प्रश्‍न

Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?


When does a force perform work?


A boy throws a rubber ball vertically upwards. What type of work, positive or negative, is done : by the force applied by the boy?
(a) by the force applied by the boy?
(b) by the gravitational force of earth?


Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.


Choose one or more correct alternatives.

Joule is the unit of ______.

  1. force
  2. work
  3. power
  4. energy

State the conditions of equilibrium for a rigid body.


Why is the work done on an object moving along a circular path zero?

How many joules are there in 1 mega joule?


Write an expression for work done by a force depends?


A body is pivoted at a point. A force of 10 N is applied at a distance of 30 cm from the pivot. Find the moment of force about the pivot.

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


State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.


Find the kinetic energy of a car of mass 1000 kg traveling at 72 km/h.

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Define Translational motion.


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.


Is power a scalar or a vector quantity?


Name two places in India where electricity is generated from nuclear power plants.


The weights of two bodies are 2.0 N and 2.0 kgf respectively what is the mass of each body?


Mention whether work is done or not in the following activity.

S. No Activity Work done or not done
1. Pushing the door  
2. Holding a doll  
3. Sitting in a bus  
4. Pushing a wall  
5. Digging soil  

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