Comment on Perpetual motion eludes us again.
Kolanaki@pawb.social 1 day ago
It would work if the repulsion/attraction only went in 1 direction. But since it goes both ways, they just cancel out.
Conversely, the fan version of this idea (fan blowing into a sail) does actually work. But it’s nowhere near as efficient as simply turning the fan away from the sail to push you the normal way.
You think it would work if one end is a magnet and the other ferrous metal? I’m pretty certain it wouldn’t
Whatever happens there’s no work done as the magnet and it’s partner don’t move relative to each other. There’s force between them, but no movement.
You think it would work if one end is a magnet and the other ferrous metal?
No, because the force of attraction is still working in both directions just not as strongly as it would with two magnets.
Curse you physics
Yeah, as long as no other energy is put into the system, nothing will happen. Since the two parts are statically attached to the same object, so no additional movement or energy means no effect on the overall object.
This is basically like putting two nails in a piece of wood and stretching a rubber band between them. Nothing will happen without additional steps.
iAvicenna@lemmy.world 1 day ago
Well because there the whole system now becomes the ship+air/water molecules rather than just the ship + you use energy to work the fan which imparts that energy to the air/water molecules.