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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
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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
Write true or false of the following statement.
Potential energy changes into kinetic energy when it is put to use
Fill in the blank
The ability to do work is called ______
What is potential energy ? State its unit.
State two factors on which the potential energy of a body at a certain height above the ground depends.
Tick the most appropriate answer.
The force applied on a machine to do work is called the
Answer the following in a word or two or in a sentence.
Write the formula for calculating the efficiency of a machine.
Answer the following in short.
What do you understand by the term efficiency of a machine’?
Derive the relation between commercial unit of energy (kWh) and SI unit of energy (joule).
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 ______.
