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REVIEW Unit 4 – Mechanical Systems 1.0 Machines are tools that help us do work A machine is a device that helps us do work Energy for machines to operate is provided by people, animals, electricity, fossil fuels
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Document Date: 2014-02-28 13:55:41
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REVIEW Unit 4 – Mechanical Systems 1.0 Machines are tools that help us do work A machine is a device that helps us do work Energy for machines to operate is provided by people, animals, electricity, fossil fuels