![]() Even if such a machine could be built, it could only be used to store energy forever, and not to produce energy. Although it is impossible to make such a machine, because the loss of energy cannot be completely eliminated in a mechanical system, it is still possible to reduce the loss a great deal. This violates the third law of thermodynamics. Because of the inertia of the mass, it can therefore maintain motion forever. A perpetual motion machine of the third kind is one that can eliminate effects like friction and other effects that use energy.For this reason, they can convert all the heat into mechanical work. Perpetual motion machines only have one reservoir for the heat. Some of the heat is converted into mechanical work, the rest is used to heat the cold reservoir. Such engines have two reservoirs: the heat is transferred from the hot one to the cold one. Real heat engines, such as those found in cars, also convert heat energy to work. Such machines violate the Second law of thermodynamics. In itself, this does not violate the law of the conservation of energy, because there is the same amount of mechanical work than there was of thermal energy. A perpetual motion machine of the second kind spontaneously converts thermal energy into mechanical work.It violates the law of the conservation of energy. A perpetual motion machine of the first kind produces energy from nothing.Each type breaks a different law of thermodynamics: Perpetual motion machines have been classified into different types. Perpetual motion machines have interested inventors for a long time, and even though it has been shown that such a machine cannot exist, people still try to build them. This law states that energy cannot be created, or destroyed, but one form of energy can be transformed into a different one. ![]() Such a device or system would be against the law of conservation of energy. A machine that could be set in motion once would continue to move forever. Perpetual motion refers to a movement that goes on forever once started without additional energy added. Many people think this device is the first recorded attempt to describe such a device in order to produce useful work - driving millstones. Robert Fludd's 1618 "water screw" perpetual motion machine from a 1660 woodcut.
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