• http://zoomzee.org/5301/engine-hoist-needs-to-be-a-smart-purchase - Heat engines burn a fuel to create heat which is subsequently utilised to do work. Electric motors convert electrical energy to mechanical movement; analog motors utilize compressed air; and clockwork motors in windup toys utilize elastic energy. In biological processes, molecular engines, such as myosins in muscles, utilize chemical energy to produce forces and eventually motion.

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