this post was submitted on 22 Dec 2023
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Okay. Maybe even dumb it down a little more? Just in case someone out there still doesn’t get it. Not me, I get it. Just someone else might not, and what about them you know?!
When the magnet got glued to the car, it became part of the car so it wouldn't actually move. The reason it moves when it isn't glued is because the hand keeps pulling the magnet away
So the end of the video where the car is moving when the magnets are glued is just an editing trick?
It's probably one of those toy cars where pulling it backwards winds up a coil thing inside, then releasing it drives it forward.
There's another magnet on the back of the car, my guess is they're holding another one just out of frame and using it to push the car
Imagine a string instead of two magnets. If the hand pulls the string, the car moves. If the string is tied to the car?
Magnets transmit force, they don't magically create energy. It takes energy to move the car, not just a static force being present. It's the same as taping a stick to it without the magnets. Unless someone pulls on the stick (or magnet), no energy is entering the system and no work can be done.
Time to draw some free body diagrams!
Actually it would be the same force on the car if you removed the arm holding the magnet and placed a block of wood in the space between the magnets. It's a static system
Just like the hanging magnet is pulling on the car, the car magnet is also pulling on the hanging apparatus. Unfortunately for the car, the apparatus is attached to it, so it all cancels out.