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Acceleration Of Gravity
Cycles of water
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Energy is the property something has which enables it to do work. The more energy something has, the more work it can perform. Every kind of energy falls into one of the three general categories: kinetic energy, potential energy, and rest energy. The units of energy are the same as those of work, namely, the joule and the foot-pound.
History of (Energy)
The sun was the first source of energy, it provided light and heat to the first humans. Then along came fire, that was just sprung on them with a spark of lightning. People begin to use wind to move from one place to another. Wind was the first source of energy used for transportation.
Application of (Energy)
Energy cannot be created nor destroyed, but it can be transformed from one kind to another. The total amount of energy in the universe is constant. Windmill were developed for miling grain for food production.
Beiser, A. (1988).
Physical Science (2nd Edition)
. New York, NY: McGraw Hill
Science & Stories - Inegrating Science and Literature (Grades 4-6),
by Hilarie N. Staton and Tara McCarthy, GoodYear Books, 1994
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