From a nylon wheel with a 40 gramme OB driver weight, we fling a magnet weighing say 20 grammes 0.8 x the height of the driver weight loss. The magnet then ataches itself to a steel plate which happens to be up there.
An inert (non magnetic) identically sized flung object will go from gpe, ke, to gpe if caught in a hopper, at apex preferably.
The magnet is a N45 28 kg nominal force. That means that it's "potential energy" on being attached is what ? You need 28 kgs pull to remove it from the steel plate and get your gpe to ke.
As one supposes that the magnet's qualities (eg 28 kg potential) has in no way changed during the process (the only change being it's environment: non magnetic to ferrous), one totally discounts the fact that 28 kgs force/very real resistance have been "added" to the setup ?
We got this magnetic conservative potential which manifests itself in a certain form upon a change in environment.
It's like a pingpong ball which has for sure a bouncability/cor or just straight gpe. But if we change the environment to water, whaddayaknow, we got buoyancy potential.
So running brain.exe and associated programmes says that how do you get a magnet into a pingpong ball, 'coz that's a task which defeated even Einstein, and if you doubt that show me where he demonstrates that you can get a pingpong ball with a magnet in it.
So you got this aquarium w/ no fish, you got a pingpong ball with a smallish neo mag in it, on the bottom of the tank you have a big neo magnet. The ball magnet gets attracted then repelled (cause the pingpong ball kinda rotates and polarity repel stuff happens, added to the the buoyancy stuff). And this should reach a point of equilibrium at some point. Except each time the pingpong ball/mag gets a differential in attraction from the big mag, it creates turbulence in the water, which is even more unpredictability, causing more unpredictabilty in turn, so the thing can never stop moving. Hey presto, PM.
You can keep the Nobel fiziks prize, just send the bread this way please.
Edit : brain.exe is in runaway mode... So the big mag at the bottom of tank we consider for reasons of simplicity as being fixed, not on a spring or else, and orientated South up. The pingpong balls (plural) have little donut or washer neo mags (6 x 2, .640 kg force) glued inside them, the glued to wall side being North. They are all north so will repel each other. "Ang on, you can holler, they'll attract from the other side. No way, mag attraction decreases I think with the square of distance, so square the dia of a pingpong ball and do the math, it's too a long way, even if by rotation that distance can decrease somewhat. "Yeah, but the ping pong ball mag combo get's attracted to the big mag in the tank, the further is sinks the greater the attraction". Hold yer hawses. The deeper the ball sinks, the more that Archie Meedys bloke becomes relevant. The force increases against immersion. The deeper you sink, the harder it becomes to sink further. Plus Archie (again) says that a pingpong ball immersed in a bucket of water will displace an amount of water equal to it's own volume, or something to that effect.
The way you get a mag into a pingpong ball is like this : the mag is dia. 6 mm. Skewer a 12 mm hole in the ball. Insert mag. Insert sticky tape and press down to secure mag. Inject a adequate amount of expansive foam from a aerosol can and wait until it dries and finishes expanding. Sand of the surplus.
Let me give you another tip : using a cyclinder container for this trick does significantly reduce the likelyhood of your pingpong balls getting caught in a corner