Why is it so difficult to build a perpetual motion machine?
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Making a perpetual motion machine is basically impossible because in reality there are always efficiency losses. Moving components experience friction, generate heat, light, sound etc, it’s just the nature of materials and physics and we don’t have any way to avoid it.
Making a perpetual motion machine that can also produce useful energy is literally impossible because the laws of physics say you can’t extract more energy than you put in to the system. So even if you could somehow make a PMM that didn’t experience any losses, you wouldn’t be able to do anything with that motion, and you’re certainly not getting free energy out of it, the energy has to come from somewhere.
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