*Promote

Self promoting this video and sending it back into the queue for one more try; last queued Sunday, October 17th, 2010 8:26pm PDT - promote requested by original submitter Shepppard.

Thought my brain was going to explode.

Just add LCD and you have days of excitement.

fuck the fans I use for white noise so I can sleep, I would rather listen to that then the osculations of the fan blades.

"Euler's Disk" is a trademark for a product manufactured and distributed by the "Damert Company" (Toysmith Group), consisting of a metal disk, a base having an upwards-facing concave mirror, and holographic, patterned magnetic stickers. One or more magnetic stickers may be attached to the top surface of the disk. The disk, when spun on the mirror, exhibits a spinning/rolling motion. Euler’s Disk has an optimized aspect ratio and precision polished, rounded edges to maximize the spinning/rolling time. A coin spun on a table, or any disc spun on a relatively flat surface, exhibits essentially the same type of motion.

A spinning/rolling disk ultimately comes to rest; and it does so quite abruptly, the final stage of motion being accompanied by a whirring sound of rapidly increasing frequency. As the disk rolls, the point P of rolling contact describes a circle that oscillates with a constant angular velocity ω. If the motion is non-dissipative, ω is constant and the motion persists forever, contrary to observation (since ω is not constant in real life situations).

In the April 20, 2000 edition of Nature, Keith Moffatt shows that viscous dissipation in the thin layer of air between the disk and the table is sufficient to account for the observed abruptness of the settling process. He also showed that the motion concluded in a finite-time singularity.

Moffatt shows that, as time t approaches a particular time t0 (which is mathematically a constant of integration), the viscous dissipation approaches infinity. The singularity that this implies is not realized in practice because the vertical acceleration cannot exceed the acceleration due to gravity in magnitude. Moffatt goes on to show that the theory breaks down at a time τ before the final settling time t0, given by

\tau\simeq\left(2a/9g\right)^{3/5} \left(2\pi\mu a/M\right)^{1/5}

where a is the radius of the disk, g is the acceleration due to Earth's gravity, μ the dynamic viscosity of air, and M the mass of the disk. For the commercial toy (see link below), τ is about 10 − 2 seconds, at which \alpha\simeq 0.005 and the rolling angular velocity \Omega\simeq 500\rm Hz.

Using the above notation, the total spinning time is

t_0=\left(\frac{\alpha_0^3}{2\pi}\right)\frac{M}{\mu a}

where α0 is the initial inclination of the disk. Moffatt also showed that, if t0 − t > τ, the finite-time singularity in Ω is given by.....

http://en.wikipedia.org/wiki/Euler%27s_disk

Warp factor 10 Scotty!

>> ^RadHazG:

Warp factor 10 Scotty!


but I've given'r all she can infinity handle captain !

Sounds like the build up in an electro song

OMG I want one SO HARD!!!!

I just had a Doctor Who flashback, and without being on the LCD.

Why are you talking about Liquid Crystal Displays? I think using Lysergic Acid Diethylamide would make this a much more entertaining toy.

>> ^GeeSussFreeK:

Just add LCD and you have days of excitement.


CRT is my drug of choice.

Also wow, the intensity really picked up towards the end. Sounded exactly like the first evolution you have in the game Space Invaders Infinity Gene for the iPhone. They probably used one of these buggers for that sound effect.

Waiting for a wormhole to open at the end

"Euler...Euler.....Euler........Euler..."

Upvote for the fart at the end

What kind of sound do fan blades make when they kiss?>> ^BoneRemake:

fuck the fans I use for white noise so I can sleep, I would rather listen to that then the osculations of the fan blades.

I want to try this in a vacuum.

Around 53 seconds, I thought to myself, "this would be a helluva time for a screaming zombie to pop up on the screen."

oddly enough this is also the sound of a thousand scorpions swarming.

>> ^BoneRemake:

"Euler's Disk" is a trademark for a product manufactured and distributed by the "Damert Company" (Toysmith Group), consisting of a metal disk, a base having an upwards-facing concave mirror, and holographic, patterned magnetic stickers. One or more magnetic stickers may be attached to the top surface of the disk. The disk, when spun on the mirror, exhibits a spinning/rolling motion. Euler’s Disk has an optimized aspect ratio and precision polished, rounded edges to maximize the spinning/rolling time. A coin spun on a table, or any disc spun on a relatively flat surface, exhibits essentially the same type of motion.
A spinning/rolling disk ultimately comes to rest; and it does so quite abruptly, the final stage of motion being accompanied by a whirring sound of rapidly increasing frequency. As the disk rolls, the point P of rolling contact describes a circle that oscillates with a constant angular velocity ω. If the motion is non-dissipative, ω is constant and the motion persists forever, contrary to observation (since ω is not constant in real life situations).
In the April 20, 2000 edition of Nature, Keith Moffatt shows that viscous dissipation in the thin layer of air between the disk and the table is sufficient to account for the observed abruptness of the settling process. He also showed that the motion concluded in a finite-time singularity.
Moffatt shows that, as time t approaches a particular time t0 (which is mathematically a constant of integration), the viscous dissipation approaches infinity. The singularity that this implies is not realized in practice because the vertical acceleration cannot exceed the acceleration due to gravity in magnitude. Moffatt goes on to show that the theory breaks down at a time τ before the final settling time t0, given by
\tau\simeq\left(2a/9g\right)^{3/5} \left(2\pi\mu a/M\right)^{1/5}
where a is the radius of the disk, g is the acceleration due to Earth's gravity, μ the dynamic viscosity of air, and M the mass of the disk. For the commercial toy (see link below), τ is about 10 − 2 seconds, at which \alpha\simeq 0.005 and the rolling angular velocity \Omega\simeq 500\rm Hz.
Using the above notation, the total spinning time is
t_0=\left(\frac{\alpha_0^3}{2\pi}\right)\frac{M}{\mu a}
where α0 is the initial inclination of the disk. Moffatt also showed that, if t0 − t > τ, the finite-time singularity in Ω is given by.....
http://en.wikipedia.org/wiki/Euler%27s_disk


Nerd.

Fascinating. This sounds exactly like granular synthesis.

For a sec there I thought we had perpetual motion.

I don't think I'd ever be able to watch that in person without putting my finger on it. For some reason it was just making my finger itch to stop it

If Leo would have used this thing in Inception, the movie would have been, well even longer...

This is typical of any thin heavy disk when spun on a flat surface. We used to do the same thing with glass or metal disks on a smooth formica counter when we were kids.

>> ^Tingles:
Thought my brain was going to explode.


LOL.

I'm loving that sound.

I love the ending. I hope we get a sequel!

*promote

Promoting this video back to the front page; last published Sunday, October 17th, 2010 11:28pm PDT - promote requested by MrFisk.

This is an Euler's Disk has been added as a related post - related requested by mxxcon on that post.