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1.what goes up must come down 2. for every action there is a opposite reaction 3. gravity is a force that pulls us to the ground,,, cause without gravity we would float into space Read more: http://wiki.answers.com/Q/What_important_contributions_did_Sir_Isaac_Newton_make#ixzz1yH5aqKil
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uses copper, zinc, and salt water
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uses a magnet
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J stands for 1 Joule
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Adams power plant
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