The internet thinks it has discovered the secret to fuel-free perpetual motion. Physics knows better.
Finally, we have the crane itself. I left off some of the unimportant forces here—the most critical are the forces from the magnet and the cart pulling in opposite directions.
I think part of the reason it’s hard to grasp why this won’t work is that you can't directly see the attractive interaction between the magnet and the cart. That sort of makes it seem like magic—and magic can make things move.
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