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When a body falls freely towards the earth, then its total energy - Science

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प्रश्न

When a body falls freely towards the earth, then its total energy

पर्याय

  • increases

  • decreases

  • remains constant

  • first increases and then decreases

MCQ

उत्तर

remains constant

Explanation:

When a body falls freely towards the earth, its potential energy decreases which in turn increases the kinetic energy. Therefore, its total energy remains constant.

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पाठ 11: Work and Energy - Multiple Choice Questions [पृष्ठ ६८]

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एनसीईआरटी एक्झांप्लर Science [English] Class 9
पाठ 11 Work and Energy
Multiple Choice Questions | Q 1. | पृष्ठ ६८

संबंधित प्रश्‍न

Write true or false of the following statement.

In an electric fan, electrical energy changes into the mechanical energy.


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


What is potential energy ? State its unit.


Answer the following in short.

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


A certain household consumes 650 units of electricity in a month. How much is this electricity in joules?


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.

Can you tell?

When can we say that displacement has taken place?


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When we have run a long distance, we feel tired. We have to stop. Why is that?


Write the type of energy.


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