Part 2/7:
First Kind: These machines violate the principle of energy conservation by claiming to output more energy than they consume. Historically common, these designs primarily emerged before the formulation of the first law of thermodynamics.
Second Kind: These machines attempt to extract energy by reversing entropy, undermining the second law of thermodynamics. Many modern "free-energy" devices fall under this category, claiming to tap into uniformly distributed energy.
Third Kind: Unlike the first two, these machines do not claim to create energy but rather to maintain motion indefinitely without external energy input. However, similar challenges remain due to inevitable energy losses from friction and radiation.