Name: 玻璃開裂的速度有多快？- 慢摩族 (How fast does glass crack? - The Slow Mo Guys)
Uploaded: 2021-01-14T09:43:18.000Z
Duration: 9 min 49 s
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情態助動詞 A2

Hello there, I'm Gav. I'm Dan. We're the Slow Mo Guys. This should be a nice simple video. How fast does glass crack?

過去簡單式

I actually don't know but we did that one video with the Pyrex jug where we saw it

過去進行式

Yeah, but it was actually quite difficult to figure out the speed because the, the crack was going through a curved

Pyrex jug handle. It was about this big. It's almost like we need a really long piece of glass with foot markers on it.

Where could we, uh, get one of those, do you think?

Oh! Oh, here's one. Look at this. I wondered what this was doing here.

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 I've done here with our 7-foot piece of glass is I've spray-painted exactly a foot along the glass

Now a foot's gonna start at, 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 exactly a foot from here, etc

So you should be able to calculate the exact speed

For glass as we know we need very high speeds.

The Phantom Flex4K only does a thousand frames a second.

Might see–it'd be couple of frames, maybe, if that.

We've got the "Twenty Five Twelve" here today. We usually use the "Twenty Five Eleven"

Has a different CineMag and a much bigger internal memory. But other than that, it's the same camera

So we'll start at 28,500 frames a second.

A bit nerve-racking, this. Oh, yeah, you're telling me!

A bit of foam I see you've got there for protection.

Yeah, you've gotta protect the glass–otherwise it'll smash before we're ready.

Cool. So I'll 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

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

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

Yep, 63 get some a darker. Probably not much sure to compensate

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

Lovely so the right-hand side of these or your left will be a foot long. This is pretty satisfying

When you get a chance, okay, let me try and fill the frame with this mad lad go for it my level

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

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

14-foot glass circles, unfortunately good church window

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

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

Ridiculous, how much can you see bloody stupid? This is

She's that one pot? Let's look at this ridiculousness

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

Another pretty aftermath that is not bad. It sounds like snow - listen

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玻璃開裂的速度有多快？- 慢摩族 (How fast does glass crack? - The Slow Mo Guys)

stretch

physical

demonstrate

expect