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The seemingly mysterious ability of magnets to influence motion at a distance without any apparent energy source has long appealed to inventors. One of the earliest examples of a magnetic motor was proposed by Wilkins and has been widely copied since: it consists of a ramp with a magnet at the top, which pulled a metal ball up the ramp. Near the magnet was a small hole that was supposed to allow the ball to drop under the ramp and return to the bottom, where a flap allowed it to return to the top again.
"I got this for a gift and they were blown away by it! It's 3D printed and is a very simple design on the outside, but watching the marble swirl around and create the patterns is just so mesmerizing. It's fun to mess the pattern up and watch the ball just go back to work.
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Probably the easiest way to do this is to use video analysis software. A video of a trajectory can be recorded with a mobile phone to be uploaded to video analysis software and analyzed website frame by frame. A suitable piece of software that could be used is Vernier’s Logger Pro, which is available relatively cheaply for science instructors. Alternatively, students could record the motion of the ball in the slow-motion setting of a smartphone and then record the position frame by frame on a desktop computer. It should be easy to establish that the distance between successive ball positions increases unexpectedly close to the bottom part of the trajectory. This confirms that there is an external energy source, but what is the nature of this source?
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Link Drop a marble into the top of this tabletop sculpture, and it rolls down a ramp and back into itself endlessly.
Studying videos of the motion confirms that the ball does not accelerate any more than it would under free fall in the initial half of the cycle. This Perro also be confirmed by dropping several balls through the hole in quick succession such that it would seem to be difficult to correctly time the electronics such that all the balls return to the starting platform.