engine
  • http://zoomzee.org/1358/12-driving-tips-that-could-save-your-life - Heat engines burn a fuel to produce heat that's subsequently utilized to accomplish work. Electric motors convert electrical energy into mechanical motion; pneumatic motors utilize compressed air; and clockwork motors in windup toys utilize energy. In biological systems, molecular engines, like myosins in joints, utilize chemical energy to make forces and eventually motion.

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