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प्रश्न
State two factors on which the potential energy of a body at a certain height above the ground depends.
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उत्तर
The potential energy of a body in the raised position depends upon the following two factors:
(a) The mass of the body: Greater the mass of the body, greater is the potential energy of the body.
(b) Its height above the ground: Higher the height of the body, greater is its potential.
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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
Write true or false of the following statement.
One form of energy cannot be converted into another form.
Fill in the blank
The ability to do work is called ______
Define the term 'watt'.
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).
- 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.
Can you tell?
What should be taken into account for measuring work?
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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What energy transfer happen in a car engine?
