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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

What is Potential Energy ? State Its Unit. - Physics

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प्रश्न

What is potential energy ? State its unit.

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उत्तर

The energy of a body at rest is called the potential energy. It is defined as follows :
Potential energy of a body is the energy possessed by it due to its state of rest or position. Actually, it is the work spent in bringing the body to that state of rest or position.
It is written as P.E. or U.
The S.I. unit of potential energy is Joules.

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अध्याय 3: Energy - Short/Long Answer Questions

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सेलिना Concise Physics [English] Class 7 ICSE
अध्याय 3 Energy
Short/Long Answer Questions | Q 5

संबंधित प्रश्न

Write true or false of the following statement.

One form of energy cannot be converted into another form.


Fill in the blank

The S.I.unit of energy is ______


Select the correct alternatives 

 When a bulb lights up on passing current, the change of energy is


Select the correct alternatives 

The correct statement is


Answer the following in short.

What do you understand by the term efficiency of a machine’?


How many joules are there in one kilowatt-hour?


Name the quantity whose unit is :
(a) kilowatt
(b) kilowatt-hour


Derive the relation between commercial unit of energy (kWh) and SI unit of energy (joule).


Study the following activity and answer the questions.
  1. Take two aluminium channels of different lengths.
  2. Place the lower ends of the channels on the floor and hold their upper ends at the same height.
  3. Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance.
Questions:
  1. At the moment of releasing the balls, which energy do the balls have?
  2. As the balls roll down which energy is converted into which other form of energy?
  3. Why do the balls cover the same distance on rolling down?
    Note: The question is wrong. It should be "Why do the balls cover the same distance after rolling down"?
  4. What is the form of the eventual total energy of the balls?
  5. Which law related to energy does the above activity demonstrate? Explain.

Find out the form of energy possessed by the following thing.

A rock on the top of a hill


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