that's right you stand on the right hey it's me Destin welcome back to smarter every day I'm teaching my kids that it was to stand on the right stand on the right he's standing she's there you go all right we're in Detroit and we came here to see the American record for dominoes toppling we're really excited about it there's a young lady on YouTube her name is Lily and we watch our videos and we came to learn about dominoes but first we run the Detroit Airport so you have to see this ballon what do you call this flow that flow right there what's it called laminar flow some daddies don't teach their kids cool words like this yeah you don't you don't appreciate this what you don't appreciate laminar flow I choose to believe that it's not that the laminar flow doesn't impress them is that they were turbo excited that we got there a day early in Detroit so we could see a behind-the-scenes look at the largest Domino fall in American history seriously these videos get millions of views online but you don't get to see the people behind it and how much care and time they put into it that's why we came to Detroit a day early that's oh my goodness okay so you see your Lily yes I'm Destin nice to meet you all right so I don't I'm too scared to move anywhere where do we where do we go you can say outside of the caution tape okay this is way way more impressive in person you know what I mean yeah it's different when you actually see you live yeah like I've seen I've seen your videos in a lot of your videos but this is insane this is what you did for us that's crazy so this is the night before the competition or it's not a competition it's an event or a demonstration a demonstration that's the floor plan yeah I designed this setup this year oh wow if somebody were to mess up and knock over one thing how do you keep it from from moving on to the other ones you gotta have like there's got to be a Domino builder terminology like Safety's or well it's safety gap where you take like six dominoes out and because there's a gap if you knock it down it'll stop at the gap and we do is that what that is right there yeah right there in the corner you'll see if it if it falls this way it won't continue huh so at the end we just fill in all the gaps very carefully and this way just like a small portion of the Domino setup will be toppled if we do not get down by accident instead of the moving and this is like this is your thing right this is what you're good at yeah how long have you guys been working together three years now yeah we've been building for over ten years we've been working together for for years and we've done lots of professional projects for companies or read both advertisements logos and things like that will you walk me through what we have right now Steven Lilly showed me around the entire set up and seriously please go check out that video on the second channel it's an awesome behind-the-scenes tour of the whole set up every little thing it's amazing you're gonna like it I learned tons of Domino builders secrets that had never thought about before for example these guys make custom tools at Legos so they can speed up the process and make nice neat lines check out how they make pictures Steve wrote an entire computer program that would translate pixels into dominoes the next day we got there early and got to meet the entire team on the count of three say your name one two three yeah nice to meet you so anyway how many hours do you think like man hours woman hours do you think this represents Domino people are very precise people so you can't just ask a question and get a quick answer you have to get the actual answer there's two American Records in this particular fall right three three yeah okay what are they okay so the first one is most total dominoes toppled in America just like in general general yep in one complete fall down the second American record is the Domino largest Domino field that's the white rain there right so that's the Pokemon field that has over 12,000 dominoes okay and the third record is the largest Domino structure in America which is game over which is the finale so that's that's the largest three-dimensional ring structure in America yep but that also has over 12,000 dominoes so this is pretty fun you get all these people showing up to see this and then you get the dominant team over there they're getting in the zone it's really fun to watch [Applause] [Applause] what do you think I feel amazing this top fold without any breaks at all and I'm just I'm so happy right now oh wait so so you said every 60 Domino's is one second really no is that is that a constant no it's not a constant what do you mean it really depends on a lot of different things like the friction on the floor is probably the biggest thing the spacing of the Domino's is another thing obviously when there's more far apart they fall slower and some of the European builders actually have this theory that different colors all that difference European builders think different colors call it different speeds it could be due to the speed being different or the coloring the die whatever Z is good to have slightly different maths maybe that's it okay will you send me different color dominoes and we'll build me a gauge stick so I could do it in a high-speed video okay I'm in the garage we're about to do a domino motion analysis I want you to look at trans hat look at this hat do you like it it's great it looks like something you go to wherever you're doing a motion analysis okay so here is the high-speed camera what we're gonna do is this is what I call the swagger stick that Steve sent me it's an index so you can set up the dominoes and set them up the same every time we've got a ruler for motion analysis here and we can change out the type of material that we're knocking the Domino's over on we've got different kinds of felts and things like that we've got this dry erase board we've got some metal down here we're gonna look at all the variables [Applause] it's pivoting about that's what exactly what it's doing oh dude I just had the moment we're at all clicks it's it's rotating about the center of gravity it's exactly what's happening as its falling you have translation and rotation and so that front edge is a pivot point but if there's not enough friction are you seeing it yeah it's it's trying to rotate about its center of gravity if there's not enough friction let's put the foam or paper towel down so it can't slip and it's not gonna rotate that's gonna translate more of that energy forward isn't it so it's faster on a grippy surface no yeah on the felt surface the bottom of the Domino is slipping backwards again but it catches due to higher friction so the question is because it's slipping less does that mean the whole line is going to topple forward faster so just in a hard plastic in a clear plastic side-by-side and right at the end you can see it's very very clear it's very clear there's a difference back it up back it up did you see the clear in the back the the clear plastic ones kick out more so maybe they're slower do you want to dominate a grip or not drift No so here Domino's are heavy and they go faster that that is counterintuitive so it's 4 a.m. smarter every midnight ok look I feel like I owe you an apology because on smarter every day when I break out the high-speed camera it's like the mysteries of the universe are revealed but when I turn it on this little block of plastic we only get more questions for example the first 20 Domino's in our setup it's accelerating so we're not getting a steady state velocity of the topple until after that so I think my setup is inadequate to do what we're trying to do I mean also the fact that this thing doesn't pivot like a hinge like every research paper says it does it slips we're in an area of physics now called tribology which is the study of two frictional services in relative motion this is complicated there's a lot more Greek letters in the math now another thing like right here the way I've been triggering this I've been touching that that's inconsistent how I'm doing that if you have better ideas I feel like we need to redo this entire setup and do it right so if you would leave comments below on ideas for how to trigger that things on the setup I want to do this right but for right now I mean we've done complicated things on smarter every day but the simple Domino the simple Domino is a challenge it's hard stuff did you know that each time you buy a Casper you get a free time machine wait I want to thank the sponsor for today's video which is Casper and you get a mattress at Casper comm slash smarter Tara and I have slept on a Casper for over two years everybody asks me face-to-face are you just saying that on YouTube or do you actually like it of course I actually like it which is why I got one for the guest bedroom which my daughter took over now we have one for the boys so if you want a mattress go to Casper comm slash smarter use the promo code smarter to get $50 off there's a lot of cool things about it they'll ship it directly to your house you get to open it up it's kind of fun also you get to bypass the mattress company in the middleman so you get quality mattress for a less expensive price it's a good thing these multiple types of foam so you get the right balance between comfort and support without it being too hot and you get a hundred nights free trial if you don't like it they'll come pick it up at your house you don't have to worry about it this is my favorite part I'm not just saying this I actually do like the product and when you support the sponsor you support smarter every day which allows me to do things like support the zeal incredible science machine which is a really cool way for really neat smaller youtube channels like Lily and Steve to create videos that they love they make good stuff I think the reason it's so good is because they are seriously passionate about Domino's and that is contagious it's your support of the sponsors that make that sort of thing happen so thank you very much also go check out that video in the second channel it is rad it's a long video but I learned stuff I have never ever thought about in my entire life new stacking methods how they index them the speed of Domino's it's really fun I think you'll really enjoy it feel free to subscribe with this I earned it if not no big deal I'm Destin and you're getting smarter every day have a good one now thank you very much for letting me do that so this you did that last year too right yep you know I'm actually changing the logo on smarter every day after this video this video is like the last video using this logo it's going to be something similar

Author Since: Mar 11, 2019

  1. It was so great to have you here at the Incredible Science Machine!! You brought so much energy to the team! Thanks for highlighting our event and doing this study – it was super fascinating to watch 🙂

    This is exactly what I would have predicted: the bottom of the domino slips backwards more on surfaces with less friction and the domino line topples faster. I did my AP physics project on a similar concept and found that a smaller spacing on sandpaper (frictional surface) was SLOWER than a large spacing on sandpaper. What's interesting is that my original hypothesis was the exact opposite. From experience, usually a larger spacing is slightly slower on a normal wooden floor, but I didn't account for the floor surface when I made my hypothesis. A slippery floor surface (and also domino material, hence the color to speed variation) such as glass makes the dominoes fall faster.

    You're right though that this is more complicated than we think, and having an unexplored area of domino physics is super exciting 🙂 Can't wait to see what you discover in the next experiment!

    Also a suggestion for starting the dominoes… I feel like we need some sort of motorized toppler that very, very slowly moves forward hitting the center of the first domino near the top. If you use a small spacing, the first domino may just lean against the next domino and not topple right away, but this would allow the bare minimum force required to topple the line. You're also right that a longer line is necessary so that the speed of the dominoes can reach terminal velocity. I'm not 100% sure how many dominoes that is (this could also vary with spacing), but I'd recommend maybe 50 in the line to be safe. Thanks again for coming! And now to watch the behind the scenes 😀

  2. I think that you should make a simple machine to regulate the push of the dominos. I also think that the surfaces with more friction cause the dominos to take longer to get to max speed. I think when the bottom slips due to low friction, gravity and the weight of the dominos increases the forward velocity faster than the dominos on a higher friction surface. Perhaps you can also set something up at the end of the dominos so you can better gauge start-end points of your measurement.

  3. You can trigger it by using a rod attached to the servo.
    Using this, you can adjust height, speed of pushing, friction (you can use different materials for the rod.) etc.

    Search for "Servo motor push rod" on the net.
    It's mostly used in RC aircrafts and rarely on cars.

  4. Why not make a competition and race groups of domino's between two competitors over a distance?

  5. Awesome Domino video! Watched it yesterday. I think you should revisit the oscillating/twisting effect as they topple. Just to see if it wasn't causal to the initial uneven push, which seemed biased towards one side, possibly starting the chained oscillation? Or whether the oscillation is intrinsic to the wave-like energy propagation from an overall even push. If it's not an artifact introduced by the uneven push, then the oscillation is eerily similar to a descriptive electromagnetic propagation. Give it a more controlled environment!

  6. Well the acceleration at the beginning can be explained by the fact that when you push the first domino with the stick, that gives less energy than the dominoes falling onto the next ones further on. So at the beginning its building up energy until it somehow gets consistent

  7. I know why the heavier dominos move faster. If the force it is pushed at is the same. The mass affects it because Force= Mass *Acceleration. If the Acceleration is the same ( the force of which the domino is being pushed at ), mass is the only variable, so if the mass is greater, the force will greater as well so the speed at which the Lego moves is greater.

  8. 3:50 1512 hours is 63 days.
    7 days (24 hours) times 12 hours is 288 hours
    7 times 12 hours is 84 hours which is pretty cool.

  9. "Sorry boys, you'll have to share this one. Things will get easier when the next Casper sponsorship comes through."

  10. if the domino reaches a constant velocity, then work out the distance it takes and start this distance off cam so that once it gets in frame it is a reference point

  11. As for the consistent triggering, you can make a long enough line of dominoes and make sure that they reached the steady state speed at the actual triggering end of your setup.

  12. Hi Julien, fascinating (I'm a physicist too, as well as a fan of Hevesh#5). Lili does know something to get a reproducible start of the toppling. In some of her videos she has a little motor, rotating a vertical axis on which a small lever of wood is mounted. That topples the first domino in a reproducible manner.
    Would love to see some more results of this investigation, as well as a comparison with the sonimods, a Lili invention, where the dominoes topple backwards while still giving a forward domino effect.
    Thanks for this video, in which two of my favorite youtubers combine their presentation and skills. Really cool!

  13. If they slip MORE, I would predict they would move faster since the top is actually moving faster since the bottom slips out in the opposite direction. To trigger the dominoes, just use a spring-loaded gage block or ramp for a roller to slide down which you can start at a fixed point each time.

  14. Hey I know one of those guys in there and he is in my bible study group! Im impressed I noticed him lol. Joseph Naberhaus

  15. I wish they put like a party popper aimed to go off at the last domino. So when Game over finished we get a pop. Proper finale in my book.

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