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If you had a wheel filled with air vertically half inserted in water tank would it rotate through the buoyance made by gravity pushing pressure on the water making the density of the water more than the wheel?

i believe in the laws of physics and have read them but it still feels like it could work, because of the difference in density between the water and the wheel cycle submerging in and out the water.

I have debated with ChatGPT about it and it keeps saying that it would stop through friction but what I don't understand is why it would then have even initially started rotation and then just go to a stop rotation that seems weird as it started when not in motion

anyways I would like a clear explanation about this

better explaination: have a hollow wheel that gets more thin making sharp edges made of light but durable material pump it fully up with air

make a precise gap where the half of the wheel fits in the water container

pierce the wheel in the middle with rods attached to the water container allowing loose rotation of the wheel

Rowie
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1 Answers1

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Whatever energy you gain from having something spontaneously float due to buoyancy, you have to spend to re-insert the buoyant object at the bottom of the reservoir. You can collect energy from something floating exactly once - if you want to repeat the process, you have to reset the mechanism by spending an identical amount of energy to make it sink, leaving you exactly where you started.

You can't just slip a buoyant object beneath a column of water "for free" any more than you can put a book on the bottom of a stack without lifting the stack. This is usually the part that's overlooked when considering this type of perpetual motion machine - there is no way to get the floating object back to the bottom without spending energy.

See also: Why will this plan for a perpetual motion device not work?

Nuclear Hoagie
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