• prime_number_314159@lemmy.world
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    2 months ago

    I built a scale model to prove the haters wrong. I had to tilt the platform a little for it to overcome friction, but once I did, the car rolled forward until it hit a wall.

  • Farvana@lemmygrad.ml
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    2 months ago

    The magnet and the metal plate pull each other, so all the pull forwards is cancelled out by the pull backwards.

  • kbal@fedia.io
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    2 months ago

    Less fun at parties guy: While the diagram leaves it somewhat unclear as to what precise effect that mechanism is intended to achieve, clearly it involves electromagnetism and thus any proper explanation must begin with a full description of quantum field theory…

  • Venator@lemmy.nz
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    2 months ago

    Why not just use rope instead of a magnet? You wouldn’t need the extra metal on the front if you did that and would save weight.

    • phoenixz@lemmy.ca
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      2 months ago

      It would only work if you manage to keep the car at an extremely precise distance from the car in front. If you’re off by tiny tiny amounts, you’ll either lose the magnetic attraction, and stop, or you’d started getting closer fast until you’d be stuck to the car in front of you

          • Feathercrown@lemmy.world
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            2 months ago

            We could chain them together and make the front car really powerful. The other cars wouldn’t even need engines!

            It would get kinda hard to control though. Maybe some sort of track system could keep it steady?

    • Rakonat@lemmy.world
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      2 months ago

      Use to magnets of opposing polarity, the stronger magnet should be on the bumper to push the boom forward, and drag the truck with it. /s

        • GoodEye8@lemm.ee
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          2 months ago

          Depends on what we consider wrong. Could you pull a car that way? Theoretically, yes. Could you save energy that way? No, because the car driving in front would have to do extra work to overcome the magnet pulling it towards the car behind. You can’t cheat the first law of thermodynamics.

  • regdog@lemmy.world
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    2 months ago

    This illustration does not imply that the car is moving. There are no “speed lines” or arrows that would indicate that.

    So the illustrated setup would 100% work.

  • idunnololz@lemmy.world
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    2 months ago

    It’s actually a common misconception that magnets always attract metal. This misconception was popularized by people joking that magnets are magic. In reality, magnets attract because they have magnetions in them. These magnetions allow them to attract things like metal but a little bit is used up each time. Eventually once the magnet’s magnetions have been depleted, the magnet turns back into a newt and goes home to recharge.