Eli5: why cant we use magnets to make an infinitely spinning thing to get infinite energy

Question

-english is not my first language-

Edit: alot of people think im referring to motors or generators or some sorts. But I mean something like this:

https://i.ytimg.com/vi/BSdSDfOWbNs/maxresdefault.jpg

I know its probably fake and not possible but I want to know why and how

In: 0

Answer 1

Simply put, because it’s impossible. Why? If it was possible, it would contradict the law of conservation of energy https://en.m.wikipedia.org/wiki/Conservation_of_energy.

This is how you can immediately dismiss any intricate “inventions” that claim infinite energy production without the need to debunk each one of them individually let alone get into nitty gritty details to point out the flaw in the logic.

Conservation of energy law itself by necessity follows from the symmetry of our space-time continuum towards the time translation.

In other words — in the universe we live in perpetual motion machines (of the first kind, that produces energy from nowhere) _cannot exist_. End of story.