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| the total energy of motion and postion of an object |
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| a change from one form of energy to another |
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| a force that opposes motion between two surfaces that are touching |
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| law of conservation of energy |
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| the law that states that energy is neither created nor destroyed |
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| a natural resource that can be converted by humans into other forms of energy in order to do useful work |
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| a natural resource that cannot be replaced or that can be replaced only over thousands or millions of years |
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| nonrenewable energy resources that form in the earth's crust over millions of years from the remains of once-living organisms |
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| a natural resource that can be used and replaced over a relatively short time |
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