馃攳
Spinning an Apple until it Explodes at 28,500fps - The Slow Mo Guys - YouTube
Channel: The Slow Mo Guys
[1]
This video is sponsored by KiwiCo.
[3]
Hello the internet, I am Gav.
[5]
In this video, we're gonna
be recreating a viral TikTok
[8]
that a lot of you have very
kindly sent me, I thank you,
[11]
of an Apple being levitated
on a jet of compressed air.
[15]
Due to a phenomenon
called the Coanda effect,
[18]
it should just stay exactly
in place on the compressed air
[22]
until eventually it goes
a little bit too fast
[24]
for itself and pops.
[26]
Sounds like an excellent
subject for the Phantom.
[29]
So why don't we give it a go?
[30]
There certainly seems to
be some technique to it.
[33]
This is 150 PSI compressor
[36]
but it seems to be less about the power
[37]
and more about the slow
build to keep it stable
[42]
'cause if I end up just flooring it,
[45]
it bounces up and down
like this and loses speed.
[47]
It's all about sort of
getting it right on the edge
[50]
and then you can hear it revving up.
[52]
It's actually, the sound
is the only indication
[55]
I have that I know I'm doing it right.
[57]
And then eventually the
sound goes high enough
[59]
and you just got to clench
and hope for the best.
[61]
So this apple is able to
perfectly defy gravity.
[64]
As the jet of air bounces
off one side of the apple,
[67]
it creates an area of low pressure
[69]
between the air and the curved surface.
[71]
This area of low pressure
effectively pulls in the airflow
[75]
allowing it to follow
the curve of the apple.
[77]
At this point, as the
curve surface of the apple
[79]
is putting a force on the air,
[81]
the air exerts an equal and opposite force
[83]
upward on the apple
[84]
and that's why it's able to
perfectly float in place.
[92]
Whoa, this effect only works on objects
[95]
with a curved surface.
[96]
So if this was a mutated cube apple,
[98]
it wouldn't work at all.
[100]
It's pretty crazy, to my
eye when I'm looking at it,
[103]
I'm just looking at a blur
[104]
and then like one frame of
my eyes later, it's gone.
[108]
It's like someone's just edited out
[110]
a moment of my life there.
[111]
It's so fast.
[114]
Bloody hell, look at
the RPM on that thing.
[151]
That is baking.
[155]
Well this camera's not fast enough.
[158]
That is rapid.
[160]
It's moving fast in slow motion.
[166]
I need to cool Alabama.
[169]
All right, it's been a few days
[170]
and Destin has come
through with this 2511.
[173]
We now have access to 28,000
frames a second at 720p
[177]
which should be a lot better
for seeing the rotation
[179]
and potentially seeing
where the crack starts.
[182]
Make sure you subscribe
to Smarter Everyday
[184]
because he's always helping me out.
[186]
Just gonna do a bit of
apple art on some of these
[190]
so we can better track the rotation.
[204]
Damn it.
[273]
Awe, it's amazing, wow.
[276]
You can actually see the skin of the apple
[279]
ripping in this, at this speed.
[282]
That one gave me a rollicking on the hand.
[284]
If I wasn't wearing gloves,
[285]
that one would really hurt I think.
[292]
Okay, so now we can
roughly estimate how fast
[295]
the apple was spinning by
timing how long it takes
[298]
for this line to come
back around to the arrow.
[300]
This was the final rotation of the apple
[302]
and based on the sound it was making
[304]
and the fact that it exploded,
[306]
I'm gonna assume this was
the fastest rotation as well.
[308]
One full rotation in 9.1 milliseconds.
[311]
That's 109 rotations per second,
[315]
which reveals the apples nope speed
[317]
to be 6565 RPM.
[324]
That was something, that was very sweaty,
[325]
very loud and slightly terrifying work
[328]
but I do think we've got some
lovely looking footage there
[330]
especially with the 2511.
[332]
We saw a lot more that we didn't see
[334]
at 1000 frames a second,
like the skin ripping
[336]
almost as though the inside
of the apple has already split
[339]
And the skin is just the
final thing to give away.
[341]
Absolutely mental and I
think I do now have to invest
[344]
in some sort of long handled mop
[347]
to clean the ceiling and the walls.
[350]
Made a right mess in this one.
[352]
I think it was worth it though.
[353]
I think it was worth seeing.
[354]
I've never seen it that slow.
[356]
Now I'd like to talk to you
[357]
about the sponsor of this video, KiwiCo.
[360]
KiwiCo is a wonderful
service encouraging kids
[362]
to learn from home.
[363]
Each box contains an
engaging and fun project
[367]
or toy to construct.
[368]
Here you can enjoy footage of me
[370]
constructing this glowing pendulum.
[372]
KiwiCo offers eight subscription lines
[374]
each catering to different
age groups and topics
[377]
and every box contains
everything you'll need
[379]
for the project,
[380]
so no need for any extra
journeys to the store.
[383]
KiwiCo is also a fantastic
option for a holiday gift.
[386]
Every completed KiwiCo
crate is an opportunity
[389]
to inspire a lifetime of
curiosity and learning
[392]
and they're great for the
family to do together.
[395]
If you would like to support
The Slow Mo Guys channel,
[397]
make sure you check out
kiwico.com/slowmoguys.
[401]
At that link, you'll be
able to get your first month
[402]
of KiwiCo for free.
[404]
Thank you very much for
watching this video.
[406]
If you liked the footage you saw
[408]
and you're interested
in slow-mo in general,
[409]
make sure you subscribe.
[411]
We've got new merch and that's about it.
[413]
I'll see you in the next video.
Most Recent Videos:
You can go back to the homepage right here: Homepage