Magnetic braking of magnets sliding along a sloped aluminum surface

[lumen]

@TK
I like the disk rotation test. Is that something going on that makes the magnets spin or maybe the string wound up more in one direction than the other?

It looks like when the S pole is first in the approaching disk direction, the N pole does not want to be inline with the plate where the S pole has been. Is this just the way it looks or is something going on there?

[TinselKoala]

@TK
I like the disk rotation test. Is that something going on that makes the magnets spin or maybe the string wound up more in one direction than the other?

It looks like when the S pole is first in the approaching disk direction, the N pole does not want to be inline with the plate where the S pole has been. Is this just the way it looks or is something going on there?

I think this is a good experiment but in this video there are some obvious problems. Still, I think the result that one pole rides lower is a good one.
I need to make an arrangement where both poles see the same velocity of the moving conductor beneath them. Maybe a repeat of the "dangerous high-speed eddy current levitation" setup of Bill Beatty might work. Or I can put more hooks in my ceiling and compare the opposite region of the disk, which should reverse the velocity asymmetry beneath the poles of the magnet stack.

I tried to get the doubled fishing line untwisted, and when the magnet stack agrees with the compass I believe it is untwisted. If it is twisted it makes a bit of torque that swings the stack off North one way or the other.

In Scott's video he doesn't give credit to Lumen but I pointed out in the comments to that vid that Lumen (and X0000013) first pointed out the effect to me.

[lostcauses10x]

TK I see a hinged or gimbal holder for such tests.  Not going to be an easy thing on a driven plate.

The other method I see with such is a very long plate on a liner slide as a driven plate.

[lumen]

A rotating beer keg?

This sounds like a fun experiment. The keg needs to be empty!

[lostcauses10x]

The keg needs to be empty!
LOL I will help with that, the emptying part that is..

A rotating beer keg?

This sounds like a fun experiment. The keg needs to be empty!