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प्रश्न
When a body falls freely towards the earth, then its total energy
विकल्प
increases
decreases
remains constant
first increases and then decreases
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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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संबंधित प्रश्न
What do you mean by conservation of mechanical energy? State the condition when does it hold.
What is energy?
Name the commercial unit of measurement of energy.
Name the quantity whose unit is :
(a) kilowatt
(b) kilowatt-hour
A certain household consumes 650 units of electricity in a month. How much is this electricity in joules?
- Take two aluminium channels of different lengths.
- Place the lower ends of the channels on the floor and hold their upper ends at the same height.
- 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.
- At the moment of releasing the balls, which energy do the balls have?
- As the balls roll down which energy is converted into which other form of energy?
- 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"? - What is the form of the eventual total energy of the balls?
- Which law related to energy does the above activity demonstrate? Explain.
The capacity that an object has for doing work is called ______.
Observe the picture and put a tick (✓) if work is done and put a cross (x) if work is not done.
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Running water possesses ______.
Which one of the following requires wind energy?
