How fast does glass crack? - The Slow Mo Guys

How fast does glass crack? - The Slow Mo Guys
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    Hello there, I'm gay. I'm Dan where the slow mo guys. It should be a nice simple video how fast is glass crack?
    I actually don't know but we did that one video with the pirates jerk where we saw it
    Yeah, it was actually quite difficult to figure out the speed because the the crack was going through a curved
    Pyrex jug handle was about this big. It's almost like we need a really long piece of glass with foot markers on it
    where could we get one of those you think oh
    Okay. So here's one. Look at this. I wonder what this is doing it
    So in theory if we break this at one end the crack should rush through it
    I'm gonna put foot lines on it and we'll be able to determine the exact speed of a glass break
    What's done here with our 7-foot piece of glass is I've spray-painted exactly a foot along the glass
    Now a foots gonna start and from the cameras point of view the left-hand side of the blue
    So this edge is gonna be exactly a foot from here. And this one's gonna be that different from here, etc
    So you should be able to calculate the exact speed
    For glass as we know we need very high speeds the front of flex
    4k only does a thousand frames a second not worth
    It might see a couple of frames maybe if that we've got the 25/12 here today. We usually use the 25:11
    This is the next revision
    Has a difference than you make a much bigger internal memory. But other than that, it's the same camera
    so we'll start at 28,000 500 frames a second, but
    Never written this. Oh, yeah, you're telling me right you stand there a
    Bit of foam so you've got there for protection
    Yeah, protect the glass so they sort of smash before already. Oh cool. So hold it here. Okay, you got it. I think so
    I'm gonna bug in a ton of shutter here 45 degrees. Oh that's noise. You never do that. Why do you know in it?
    Let me just grip this with this and see if I can smash the glass with just a pair of pliers, babe. Go for it
    That works not really what Oh just vanished God I didn't expect to be able to do that and then he just went oh
    You really framed up on the edges aren't you yep three two one step oh
    Cool that's really no I'm surprised you can even see that much with the 28,000. Yeah, it's because it's so big
    This is our starting frame rate. We plan on going much faster. I also like the fact that if I speed up a bit
    it's like
    irrelevant of gravity it splits up and down at the same time because I guess the pressure being released just goes with
    It also shot forwards and at me once it when you crack it it sort of explodes
    Yeah, that's why it makes that like sort of sound or it pops because it like has the pressure built up
    I guess I did this with pain instead of tape. Oh
    Yeah, yeah, you could see it separating. You can actually kind of see where everything was even in the air
    It stays jagged directly in line underneath each other
    Faster oh, yeah
    so the way you can increase the framerate on the phantom cameras is you just lower the resolution and
    As you may have noticed the top on the bottom of the frame here a complete
    Garbage nor a waste. So what I can do is keep the width the same but lower the vertical resolution
    So maybe something like that and that way we're keeping all of the useful area
    But it will give us the chance to go to
    Yep, 63 get some a darker. Probably not much sure to compensate
    Should be
    So this time I'll get some different colors in the go
    Yeah, I'm gonna start by spraying each foot marker with a different color painting with den. Yeh
    I'm just gonna get on the table here are in a rush. They
    That's read done I like that you're doing this across two tables so you rank both at once I won't
    Enjoy that
    Lovely so the right-hand side of these or your left will be a foot long. This is pretty satisfying
    Slop it in there
    When you get a chance, okay, let me try and fill the frame with this mad lad go for it my level
    Okay, Dan, it's time for some maths
    Versus I'm gonna get up the true
    Time of this crack and we'll measure how long in seconds it took each foot to break
    There's a slight discrepancy between each one just because of which side of the foot mark of the crack landed on that particular frame
    But don't worry will a ver each term out more Matt
    Giving us average time of point zero zero two
    seconds per foot which is forty seven hundred and fifty eight feet per second and for the international audiences, that's
    1,450 M years per second
    3262 miles per hour
    5250 km/h or mac
    You know, my mind is blown. I don't think that there's anything that's like physical but that's quick
    What's physical that that's quickly? What goes Mac 4.2 apart from spaceship?
    It's almost it's weird how like none of it overtakes anything else like, okay so it starts as round right?
    See that it's not rounded. Yeah, so the middle of the glass is actually ahead of the sides
    But it catches up and then it's all just going in a line. Do you know I think
    Right, that is not I don't expect to see there
    I think it what it looks like is if this was actually a circle like if it was like a 14
    Foot circle. Yeah, and you smashed the middle it would all go out in a circle
    But we're just seeing like a section of that. So if you imagine that
    It starts off as a small circle it gets bigger and bigger. It doesn't it's not actually flat when he gets the end
    It's still slightly curved. So I'm just imagining a circle getting bigger. Therefore. The edge is getting flatter. Yeah, exactly
    Mental now can't want to do it a big circle
    fresh out of
    14-foot glass circles, unfortunately good church window
    alright, so that was
    78,000 multi-coloured. Yeah, I think it's time to get carried away
    This bad boys the capable of some serious, let's Lincoln. Let's let it stretch this legs
    Thank you every spin
    Will reduce the horizontal width as well
    Lose some more on the vehicle
    maybe go
    To five six by
    Ninety six, that's small enough giving us a frame rate over four hundred and eighty one and a half
    Thousand frames a second because we're now so cropped in
    I'm only gonna be seeing two colors. So there's no point painting the rest waste the paint waste a paint
    Glass is cool Oh
    Ridiculous, how much can you see bloody stupid? This is
    She's that one pot? Let's look at this ridiculousness
    It just looks like a software wipe
    it's just like we took two fixes then just wiped across it just instantly turns it to like lizard skin just turns into like
    Scales this cameras. So cool just records all that like that happened and it recorded it at that. Yeah this camera saw everything
    final aftermath
    Another pretty aftermath that is not bad. It sounds like snow - listen
    Don't like snow but what's cool is the fact that cuz obviously we did it all in in color order. It's all stayed there and
    Look, this is all
    This looks like it's an intact piece of glass but it's actually oh, yeah, at least smash it's gone
    It's just held together by there. Yeah, which is why it was good that lab
    We didn't record the the paint side who recorded the front side so you can see the cracking around the color
    Well, we learned the speed that a crack propagates through laminated sheet of glass
    Yeah, they've temp in action. You couldn't tell with the the little video we did before but that really demonstrated
    It was so fast
    and and the way it starts as a circle and then basically gets
    Bigger for in a circle, even though it's a flat rectangular piece of glass. I was really impressed by that
    I didn't I didn't expect to see that
    I guess you'd never know it unless you see a long piece of glass slow motion in my head
    You were gonna crack it and it would just come across as a straight ball the whole way of outside
    Oh, of course. It's gonna crack from that point and then the fact that it evened out was very cool to me
    Yeah, it was awesome
    Hopefully you enjoyed that video bung it alike. If you did, there's a dislike button - that's always fun. Subscribe to the slow
    Mo guys and we've got a second channel any closing thoughts Daniel gets a bear get a broomis will get a get a broom
    Yep for this got this grass
    Glass grass grow I met grass that time. Okay. Yeah because I'm gonna sweep up the glass from the grass
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