Marble perpetual motion machine - GIF

Marble perpetual motion machine.

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Previously:

https://www.homemadetools.net/forum/...246#post192067
https://www.homemadetools.net/forum/...514#post193075
https://www.homemadetools.net/forum/...520#post189431
https://www.homemadetools.net/forum/...139#post134471
https://www.homemadetools.net/forum/...873#post152574

It looks like the last part is a video loop. Clearly, there is friction so is not a perpetual motion machine.

No, not a loop.
Watch the ball just as it enters the hole each time.

There must be something adding energy because the return jump is higher than the drop height.

And the energy of the ball as it rebounds off of the backside of the 'cup' is rather high.

Nicely done illusion.

Any thoughts on how it's done?

apparently there is a battery hiding in there, but I don't know how they work unless there is a magnetic ring giving the bearing a "shove" down the chute to overcome friction effects. Copies of this appear online in the chinese websites (Aliexpress) for around $15 - those listings mention the batteries, but nothing about how they work.

Quote:

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Originally Posted by desbromilow

apparently there is a battery hiding in there, but I don't know how they work unless there is a magnetic ring giving the bearing a "shove" down the chute to overcome friction effects. Copies of this appear online in the chinese websites (Aliexpress) for around $15 - those listings mention the batteries, but nothing about how they work.

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thinking further about it, perhaps a small drive wheel inside the hole - similar to the mechanism you see for pitching baseballs - smaller and easily concealed inside the bottom of the cup.

With 3 wires supporting the platform, batteries and a circuit could be in the base and a coil around the hole.

Here's the 'spoiler' video
https://youtu.be/trC5Dg3Vpi0

And, it IS a spinning wheel.

Charles, thanks for finding that video!!! it's fun to try reverse engineering how things work, but another to finally know what is the correct answer eventually. - Thanks,
Des

Whew, for a minute there I thought the First Law of Thermodynamics had finally been breached!
/s

Quote:

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Originally Posted by Duke_of_URL

Whew, for a minute there I thought the First Law of Thermodynamics had finally been breached!
/s

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No over unity is still safe for now, but I'm still waiting for people to finally figure out that all this hype about being able to fully charge an EV battery in minutes instead of hours is mostly hype, and is going to eventually cause brownouts in the already over taxed grid.