Wine glass resonance in slow motion

Vibration and shattering of a wine glass in front of a loudspeaker. The tone matches the glass resonance frequency

[CJDownz]

Definitely the best video depicting a slow-motion glass fracture with a good example of time passing between shattering of the different locations.

[austinhenning]

I'm going to find the frequency of the spleen of my enemies

[iamkabilash]

I've learned this at school! But never seen such a slow motion video!! Great work!!

[samkang]

Who else is here because their physics professor provided this for learning purposes?

[kgortney]

This is one of the best demos !!! thank you.

[bedsareuseful]

Great explanation - the sounds waves add energy until the glass breaks. It's like pushing someone on a swing. When you push someone on a swing you add energy. If you add too much energy to the swing then the child will get fucking catapulted.

[Muslimc]

It's a "driven damped simple harmonic oscillator" to be precise. So the sound waves are "driving" the glass back and forth.

[Muslimc]

In my honors physics class in college we used Newtons Laws and Differential Equations to actually derive equation of motion for this:

x(t) = Acosωt + Bsinωt

A = [(W^2 - ω^2)*F/m]/[(W^2 - ω^2) + (u^2)(ω^2)]
B = [uωF/m]/[(W^2 - ω^2) + (u^2)(ω^2)]

ω = "natural" frequency of glass
t = time
W = driving frequency (sound)
F = amplitude of driving frequency
u = damping coefficient (caused by friction, drag, etc)

As W --> ω, A --> 0 and B --> ∞. So amplitude of wine glass oscillations go

[nextlifeonearth]

yes, that's right. the frequency is determined by it's length, flexibility and mass. if the glass was made of dish ceramics it would be of a different mass and flexibility and thus have a different frequency. with the right frequency you might even be able to break a glass made of diamond if loud enough. the object must be breakable so no soft plastic unfortunately.

[thekiyote]

@Earaem Picture pushing a friend on a swing. In order to push your friend higher, you want to push him while he's moving away from you. If you push him while he's coming at you, you're just going to stop him. The most efficient time to push is at the exact moment that he is comes to a stop before moving in the opposite direction. If you're off a bit, you can force your way through it, but in the case of sound and the resonant frequency of a wine glass, the force is very very small

[albertredditt]

They show the waves in the glass, waveform amplification, like i said...
The glass wobbles more than the speaker travels.
The speak travels like 1/16 and the glass wobbles like 3/16

If the glass didn't break ( made of rubber)it would wobble like 1 or 2 inches after a few seconds ..

[brianbrown]

Hey, gr8 I think it would be cool to see leaves budding on trees in time lapse.

[betsegura]

what happen if we make it to water? can separate hidrgogen from water?

[Muslimc]

driving frequency, or the sound wave) appears in numerators of A and B. So, there is a direct positive relationship there.

Also, you're right the experiment wouldn't work in a vacuum since there's no sound in a vacuum :)

[Earaem]

Sound waves are shown to 'push' the glass at the point where the 'hit' it.
But why are soundwaves of other frequencies unable to produce the same effect (of hitting and pushing) ?

[DarksideJohnny]

Okay, that sounds better. But this is what I think is going on. That the frequency is dialed, achieving resonance with the glass molecules but is of a higher amplitude, therefore breaking the glass. In essence, disrupting the glass molecules as individuals. If the resonant frequency amplitude was equal, we would see the glass wobble without breaking. The experiment deals with "resonant frequency" and yes atmosphere is involved. Would the experiment work in a vacuum? I don't know.

[chrisleeoz]

so there was a quick camera grab but was there a confirmation of the Hz for that glass? …

[El-Leion]

couldn't you in theory, break the molecular bonds of any compound with the right frequency? regardless of power?

[DarksideJohnny]

Okay, didn't see the additional comments. Thank you very much for the explanation and answering the vacuum question! :)

[sandeepkapoor]

By installing a very big speaker driven by a mega watt amplifier, you will be able to tune in the resonant frequency of earth and would be able to smash the earth into pieces.