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Unit 7 machines
Machines are instruments that make work easier. There are two types of machines: simple machines and complex machines. Simple machines have one or two parts and include pliers, screwdrivers, bottle openers, and pencil sharpeners. Complex machines have many parts and include washing machines, electric screwdrivers, watches, and bicycles. All machines need energy to work, with some using fuels like those in cars, planes, and buses, others using electricity like hairdryers and electric drills, and some using human energy like staplers and scissors.
