Car Engine

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Humans engineer engines or motors as machines that transform one type of energy into mechanical power. Heat engines, such as the internal combustion engine, burn fuel to generate heat which is then used to accomplish work. Electric motors convert electrical energy directly into mechanical movement, while pneumatic motors utilize compressed air and clockwork motors in wind-up toys harness elastic energy. In biological systems, molecular motors like myosins in muscles utilize chemical energy to produce forces that eventually lead to motion.