system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it not possible to create a perpetual motion machine with permanent magnets, that can exert a continuous force to a magnetic turbine to power a generator to gain infinite energy?
gpt
Because energy is conserved. We don't know how to create it or destroy it, we just know how to transform it. As far as we can tell, this is a limitation of the physics of our universe, not a human/technology problem. So if we're getting energy out of a device it has to be coming \*from\* somewhere and the system you're talking about has no energy input and only a finite amount of energy stored in the magnetic fields.

In the particular case of arrangements of permanent magnets, you can always setup an arrangement that applies a \*temporary\* force, but there will \*always\* be a position with no net force. The turbine will rotate until it reaches that point, then stop. That initial rotation is powered by energy in the magnetic field that you put there when you arranged the magnets. Once you use it up, there's no more force and no more energy to extract.