CHAPTER 9 Work And Energy
WORK
AND ENERGY
KEY
WORDS
|
work
|
geothermal
|
|
energy
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convenience
|
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photosynthesis
|
substances
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windmills
|
sources
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electrical
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generate
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fuels
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solar
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petroleum
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chemical
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kerosene
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batteries
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Define
the terms
1.Work:
Work is said to be done only if the force exerted on an object moves
the object from its position.
2.Energy:
Energy is the ability to do work.
Questions
and answers
Q-1Name
different sources of energy.
Ans:
Sources of energy are:
- Sun
- Water
- Wind
- Fuels and
- Earth
Q-2
List few fuels and their uses.
Ans:
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Fuel
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Use
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coal
|
coal
is used to cook food. Generate electricity.
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petroleum
|
fuel
for vehicles
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kerosene
|
It
is used for cooking
|
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Oil
|
Oil
is a common ingredient used while cooking.
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Wood
|
It
is burnt in rural areas to cook food. Wood is also burnt to
generate warmth during the winter season.
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