Domino Chain Reaction

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Iroden : "Buum"

Max Power : That retirement commercial brought me here!!

Stephen Morris : This is pretty much exactly what is done with "pumped storage" hydroelectric power systems, except they use water instead of dominos. Surplus power is used to lift water to a higher reservoir. The energy is thereby stored as potential energy. When the power is needed, the water is allowed to fall back down through a turbine. Most of the energy used to lift the water is recovered.

boletusatanicus : I still prefer Pizza Hut.

Stephen Morris : It still works.

coc0s : So clearly a pebble can start an avalanche.

fabioproductions : Troll Science.

Stephen Morris : You have to make them yourself.

Stephen Morris : This won't work. The collisions between dominos are necessarily inelastic. So some energy is lost to heat on each collision. Plus some energy is lost to heat when the dominos slide along each other with friction. Frictionless, perfectly elastic dominos would behave very differently. They would bounce back and never stop vibrating around.

Kabishen : Okay, so when's the video with 29 dominoes coming?

Percy Lipinski : It's obviously a trick by Russian hackers designed to make the democrats lose!

FreeCreeperHugs : "If I had 29 dominoes, the last one would be as tall as the empire state building" Terrorism gone dominoes?

Stephen Morris : It is a common question. The energy released is just some fraction (less than 100%) of the energy that you needed to expend to lift the dominos into place. So there is no net gain of energy to be harnessed.

GladX : A good metaphor for life challanges and creating small wins just like dominos .

Stephen Morris : 1.6X would also work. I don't know the theoretical maximum to the scale factor, but I suppose there must be one.

Stephen Morris : No: in principle a constant density will work fine. They are just hard to handle and set up if they are too light.

Stephen Morris : The people that built it lifted it up, piece by piece. Yes, it stores a great deal of energy.

Stephen Morris : I believe I used a spacing equal to the width, which is half the height. Every dimension, including the spacing, should scale by the same factor from one stage to the next. I did not make a detailed study.

Stephen Morris : Yes. I placed them apart a distance equal to their width, so of course than length is also scaled by 1.5 each step.

Stephen Morris : This is pretty much exactly what is done with "pumped storage" hydroelectric power systems, except they use water instead of dominos. Surplus power is used to lift water to a higher reservoir. The energy is thereby stored as potential energy. When the power is needed, the water is allowed to fall back down through a turbine. Most of the energy used to lift the water is recovered.

Stephen Morris : Geosynchronous means an orbit with a period of 24 hours. The moon's period is about 27 days. I think what you had in mind is that the same side of the moon always faces the earth. This is due to tidal locking.

Stephen Morris : All dimensions are scaled by 1.5; the height, width and thickness. So the volume changes by (1.5)^3.

Stephen Morris : The smallest ones are made of aluminum. The larger ones are made of plywood (laminated for the big ones). Making the smallest ones out of wood does not work too well as they are too light. They are all painted white to look nice.

Stephen Morris : The big ones are made of laminated particle board. The smallest ones are made of machined aluminum. We tried wood for those, but they were too light to handle. They are all painted white.

Lawliet45 : I love how comments have nothing to do with the video :D

Hokiebird428 : Absolutely fantastic video! You took a simple concept, demonstrated it clearly, and then explained the physics behind the "awesome" factor! Great job!

Danker Beef : *be the 14th domino .*

okrajoe : Physics for the WIN!  ( Domino Chain Reaction )

Gempressaren : Don't mix pounds and meters... keep to the metric system all together please. Great video in general

Stephen Morris : Shadowy Men from a Shadowy Planet

Stephen Morris : Well, my demo was made to fall over spectacularly, not to demonstrate energy conservation. So I cheated a bit on the density. But of course energy is still conserved --- sort of. Energy is turned into heat when the dominos bounce to a stop after falling. Also, there is some friction in how they slide over one another (friction turns kinetic and potential energy into heat). Still, the demo shows how you can release stored gravitational potential energy with a little push. They are all solid.

Stephen Morris : You would just get back out the energy you put in to stand them up in the first place --- no net gain of energy.

Stephen Morris : @TheStillRock I had the mike clipped too close to my mouth. Oops.

Stephen Morris : Right.

Jason Jase : Weird how all the guys from what I presume is 4 Chan are essentially having satirical conversations almost exclusively amongst their fictional YouTube personas. It's just so bizarre. How much time do you lot actually dedicate to this? When one of you eventually has the corresponding inevitable and catastrophic existential crisis (surely some already have?), can you message me please and tell me what it was like? I think it'd make an interesting case study. Thanks.

Bill Wilson : Hes a big guy alright. And he made those dominos crash! 

Melike Ongur : Just like Butterfly Effect..

GetJarfNasty : Heavy breathing

Victor Henderson : Cool example of potential energy in action. +Hendrik Henderson 

Tyler Farr : I wonder if anyone will react to this so their video will be titled: Domino chain reaction reaction.

Bailey Brown : 0:55 when you're trying to poop quietly in a public bathroom but it splashes too loud.

Frank Holiman : kind of similar to an atomic bomb if you think about it...

Smokin Rebs : 0_0 Boom

Tex 42 : this dude looks like the penguins younger, better brother

Liqtor : Obey gravity. It's the LAW.

Ksirtet : I like how he says 1½ times larger (250%) than the previous one when he obviously means 1½ times the size (150%) of the previous one.

woodfur00 : That is a beautiful noise.

Sarcellus : 9/11 was a domino job

MassCrusade : I noticed that the last domino fell slower or took longer to fall, if you had 29 dominos how long would it take the 29th domino to hit the ground?

Anachroschism : I'm surprised this guy hasn't been arrested and interrogated! This is obviously a terrorist training video..