Why is it so difficult to build a perpetual motion machine?
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It isn’t difficult, it’s impossible. It might be useful to define a term quickly: a perpetual motion machine is a device that never needs more input energy to sustain it once it stars moving. The fascination historically has been that this could be a limitless source of free energy. However, it runs up against a set of physical laws called the laws of ‘thermodynamics’. Thermodynamics is just a complicated wad of saying ‘the movement of energy’. These rules define how efficient any system can be. Under those rules no system can (even theoretically) be 100% efficient. As such, any ‘machine’ whether mechanical, chemical or whatever must always ‘lose’ energy to that inefficiency in the form of heat, light, sound, ‘disorder’ or several other routes. Over times these loses will take all of the energy away until the energy left to cause motion is all gone
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