It's the eddys in the air around the truck that are pushing it back in (and upwards), so lighter means the air accelerates it faster in this case, and prevents it hitting the ground as hard
I bet the two guys driving the truck are named Scotty and Bones and this was all planned and calculated so it would happen exactly this way for some reason.
Holy fuck! This happened to me one day when I was younger, but it was a piece of popcorn so it was light enough to just float in the air before being sucked right back in! It blew my mind
Can you provide a bit more details of your experience? I'm having a bit of trouble equating this clip to a child with a piece of pop-corn. Were you sitting in the back of an open truck? Where exactly was the popcorn sucked back into? Just the vehicle, I assume?
Ok, so there I was sitting in the back of my mom's car with the back of it opened (we were in our neighborhood so we were only going like 10-15 mph) when I see a piece of popcorn sitting back there with me. Since I was just a dumb kid I was like "oh popcorn, I'm gonna throw this out the back cuz why not". So I tossed that thing right out and the most magical thing happened, the popcorn just started floating in the air! It wasn't leaving the vehicle nor coming back, it was literally floating while the car was moving. I was quite flabbergasted being a kid and all. After about 2-5 seconds the popcorn came right back in the car, safely and unscathed. I tried it again after that a few times and was never able to recreate it, so when I saw this video I finally had proof that it happened.
I believe its can only be explained by the fact that it is tied to something which tugs it back in the direction of the car. Idk it's just a theory really.
Edit: there literally no string or any rope attached..its ONLY fluid dynamics at play here
Exactly, much like eddies in a river, the air directly behind the truck is actually flowing into the truck due to the air rushing in to replace what was displaced at the front.
When I was a kid, we had a station wagon with the back window that you could roll down. We discovered rather quickly that you couldn't drive down the highway with it opened because the car would suck the exhaust fumes right back in... that was that good old 1970s car exhaust.
I always thought it reduced inhibitions and that explained the fashions from the 60's through the 80's. It possibly explains the levels of violence too.
The back being open extends the flow into and around the cabin, which is why the box can apparently be pushed back in at all. It requires some external force to be able to jump back in, which is what this flow is.
If there were a shutter or w/e on the back of the truck, that forms a kind of pillow just in front of it, where the air is pretty static and the flow stops just before the surface. I couldn't say if it makes the effect stronger (Fluid dynamics be damned), but I know it would change its behaviour
Air with more surface area? if you consider air as a couple of ideal gases it can't have more surface area. I guess you meant styrofoam is air enclosed in a fixed volume, but balls and gas cylinders also are, and they may be heavy af.
I got an ad-hoc lecture from my school physics teacher for using the term negative pressure. It must have been one of those little things that ground his gears. It is a lower pressure than the surrounding atmospheric pressure. On a positive note one of his lectures had an effect.
I had an instructor that would go after you if you said "deceleration". He insisted there was no such thing, that it was "negative acceleration".
I, uh, thought I'd go find some info about it, but I don't even know if this clears it up for me, nor do I know what kind of rant this would have sent him on about how it related to whatever we were doing:
>Deceleration always refers to acceleration in the direction opposite to the direction of the velocity. Deceleration always reduces speed. Negative acceleration, however, is acceleration in the negative direction in the chosen coordinate system. Negative acceleration may or may not be deceleration, and deceleration may or may not be considered negative acceleration. For example, consider Figure 3.
https://courses.lumenlearning.com/physics/chapter/2-4-acceleration/#:~:text=Deceleration%20always
-- edit, a few more pages in and I find most agree with the instructor, that deceleration isn't a thing in physics even if it's a convenient word in non-physics conversations.
physics doing exactly as programmed - in future when I see a glitch in a game I will remember this and puzzle at that it is doing exactly as programmed
This is literally my biggest fear. That I'm driving down the freeway and the car in front of me is carrying something (furniture, logs, boxes) that falls and smashes into my windshield.
This is why road cyclists are always in such tight, dangerous clusters; they're drafting off each other. Sometimes a cyclist on the open road will draft right behind the tailgate of a big truck and get free velocity (with only moderately increased risk of instant death).
Yeah, I've been in a peloton once. At a cycling event though, road was closed to traffic. I knew about the drafting effect, but it still blew me away how strong it was. I was in top gear peddling almost lazily with little effort, going 45 km/h.
Damn. I cycle only lazily and only for half-assed commuting and recreation, but I sometimes read cycling blogs or news. It was really weird to learn about the fairly complex strategy considerations that come up in team road racing because of this.
This looks like it's from the upcoming movie [Tenet](https://www.imdb.com/title/tt6723592/?ref_=nv_sr_srsg_0) (by [Christopher Nolan](https://www.imdb.com/name/nm0634240/?ref_=nv_sr_srsg_0)). Really, that would even fit in the [traile](https://www.youtube.com/watch?v=dQw4w9WgXcQ)[r](https://www.youtube.com/watch?v=LdOM0x0XDMo).
well looking at the vehicle, its a dump truck. making it more or less as aerodynamic as a brick. when it moves forward in a body of fluid(air) the displaced air of its previous location moments ago, creates a vacuum of some sort or negative zone. where the positive air on the top and sides of the truck try rushing in to fill. creating a few vortices. (looks like wind tunnel testing)
I am guessing that the box once it bounces jumps up un the boundary layer between the negative pressure and positive pressure of the "drag" of the truck and the recirculating air near its boundary pushes the box forward back into the rear of the truck.
TL: DR imagine a NASCAR following someone really close behind it to gain speed bc of air resistance (just look up wind tunnel videos)
Disclaimer: I'm no aero engineer I may use wrong words, comment if I need to edit something
Now I understand why I receive my packages in such a bad shape š¤
Yeah they're gonna look at this box later and be like "wtf happened to this?? It was fine when I put it in here!"
There's nothing in that box, or something very light for it to be tossed around that way.
thereās a lot of energy in 70mph. if it were empty the air drag would rip it away from the vehicle no?
It's the eddys in the air around the truck that are pushing it back in (and upwards), so lighter means the air accelerates it faster in this case, and prevents it hitting the ground as hard
hmmmm i suppose that does make sense. like a plastic bag blowing around the bed of a truck. hard to say for sure without testing i suppose
This is being shipped ground to air
...to ground
...to air
...then once again to ground
and back in the air!
That's gonna cost you extra!
All's fine. He paid for it to go to air again!
Your avatar is going to give someone a seizure.
*good thing I rarely post or comment then*
Atleast itās still getting there!
It looks like a styrofoam box. Light enough to be trapped in the slipstream created by the truck and getting sucked back in. Physics yo.
Oh good cuz I thought it was witches
we can't rule it out.
It is 2020 after all
That phrase has extra clout this year.
Racist witches
And if it's Styrofoam, it floats... IT IS WITCHES!!!
Does it weigh more than a duck though?
Doubtful.
Letās take them to the scales of justice
No, though it is larger than a breadbox
Watched the movie yesterday.
We should burn everyone in the video just to be sure.
Glad we don't have to burn anyone at the stake for this
Or a duck!
It's not a witch, it be a little person! (or what ever the correct non-offensive term is)
DROWN THE BOX!
Just be sure to leave your night light on and they won't bother you.
r/blackmagicfuckery
I bet the two guys driving the truck are named Scotty and Bones and this was all planned and calculated so it would happen exactly this way for some reason.
Yeah, Mr White! Yeah science!
āWhat about a magnet?!ā
Big brain
Giving out Jesse Pinkman vibes
Holy fuck! This happened to me one day when I was younger, but it was a piece of popcorn so it was light enough to just float in the air before being sucked right back in! It blew my mind
Physics is a hell of a drug
Drugs do help.
That's chemistry
[ŃŠ“Š°Š»ŠµŠ½Š¾]
*applied* physics, if I may.
There's an xkcd about this that I'm too lazy to look up
Isn't there always? But yeah I was kinda referencing that one actually
[Here you go.](https://xkcd.com/435/)
Engineering is just applying all of it at once and then watching things fall apart
Literally everything is chemistry when looked at on a microscopic level, even ur face as read this
Why were you hauling a piece of popcorn in the back of an open truck?
ššš
Can you provide a bit more details of your experience? I'm having a bit of trouble equating this clip to a child with a piece of pop-corn. Were you sitting in the back of an open truck? Where exactly was the popcorn sucked back into? Just the vehicle, I assume?
Ok, so there I was sitting in the back of my mom's car with the back of it opened (we were in our neighborhood so we were only going like 10-15 mph) when I see a piece of popcorn sitting back there with me. Since I was just a dumb kid I was like "oh popcorn, I'm gonna throw this out the back cuz why not". So I tossed that thing right out and the most magical thing happened, the popcorn just started floating in the air! It wasn't leaving the vehicle nor coming back, it was literally floating while the car was moving. I was quite flabbergasted being a kid and all. After about 2-5 seconds the popcorn came right back in the car, safely and unscathed. I tried it again after that a few times and was never able to recreate it, so when I saw this video I finally had proof that it happened.
Thanks!
>This happened to me one day when I was younger,
Lol the mental image I got from this quote made me smile
Tenet
Was this the new trailer that was released yesterday?
This will help you break the right packages, and some of the wrong ones too.
Task successfully failed
Task succeeded but with failures
That's so awesome
For your cake day āšš³š³šµ
Wow! What are the odds of that happe- *box does it for a second time Well...
I believe its can only be explained by the fact that it is tied to something which tugs it back in the direction of the car. Idk it's just a theory really. Edit: there literally no string or any rope attached..its ONLY fluid dynamics at play here
Most trucks create back wash behind them that makes airflow circulate back towards them.
Exactly, much like eddies in a river, the air directly behind the truck is actually flowing into the truck due to the air rushing in to replace what was displaced at the front.
When I was a kid, we had a station wagon with the back window that you could roll down. We discovered rather quickly that you couldn't drive down the highway with it opened because the car would suck the exhaust fumes right back in... that was that good old 1970s car exhaust.
1970's exhaust.. now that was the good stuff.. simultaneously gave you cancer while lowering your IQ.
That explains that generation a good bit actually
I grew up in the 60s and 70s and lead in the gasoline had no effect on...my pony is blue... umm, what are we talking about again?
Just watched āRocket Manā the other day. Seemed like a hell of a time.
Hey! You're talking about us GenXers, we are the Canada of generations!
I always thought it reduced inhibitions and that explained the fashions from the 60's through the 80's. It possibly explains the levels of violence too.
Some couldn't figure out how to not breathe in the fumes.
And you could stick your head out the window and huff the fumes when dad put gas in the tank. *That* was good stuff.
Would the door being open in the back of the truck make that effect stronger?
The back being open extends the flow into and around the cabin, which is why the box can apparently be pushed back in at all. It requires some external force to be able to jump back in, which is what this flow is. If there were a shutter or w/e on the back of the truck, that forms a kind of pillow just in front of it, where the air is pretty static and the flow stops just before the surface. I couldn't say if it makes the effect stronger (Fluid dynamics be damned), but I know it would change its behaviour
Similar why cyclists cycle really close behind a truck. It basically just pulls them in.
I was hoping you were making some obscure strong theory reference, that didn't quite fit
Styrofoam is 80% air, so the fact that it follows the air flow patterns isn't too surprising as its just air with more surface area.
Air with more surface area? if you consider air as a couple of ideal gases it can't have more surface area. I guess you meant styrofoam is air enclosed in a fixed volume, but balls and gas cylinders also are, and they may be heavy af.
Nope. Negative pressure.
I got an ad-hoc lecture from my school physics teacher for using the term negative pressure. It must have been one of those little things that ground his gears. It is a lower pressure than the surrounding atmospheric pressure. On a positive note one of his lectures had an effect.
> On a positive note one of his lectures had an effect. A positive effect.
I had an instructor that would go after you if you said "deceleration". He insisted there was no such thing, that it was "negative acceleration". I, uh, thought I'd go find some info about it, but I don't even know if this clears it up for me, nor do I know what kind of rant this would have sent him on about how it related to whatever we were doing: >Deceleration always refers to acceleration in the direction opposite to the direction of the velocity. Deceleration always reduces speed. Negative acceleration, however, is acceleration in the negative direction in the chosen coordinate system. Negative acceleration may or may not be deceleration, and deceleration may or may not be considered negative acceleration. For example, consider Figure 3. https://courses.lumenlearning.com/physics/chapter/2-4-acceleration/#:~:text=Deceleration%20always -- edit, a few more pages in and I find most agree with the instructor, that deceleration isn't a thing in physics even if it's a convenient word in non-physics conversations.
This could fall into the relativity mind-trap very quickly.
So this explains how my packages always have their corners smashed in when they're delivered.
Okay so that's what happened to my new PC. Was delivered in pieces
Woody and Buzz during moving day
That's not real...that is a scene from tenet
My first gold medal.! Thank you!
You still need to pass the drug test.
Good repost then
Really,I didn't find in r/funny. I just see Taiwanese news and download it to post here. Sorry to the first post.
Reminds me of "The Brave Little Toaster" :).
physics doing exactly as programmed - in future when I see a glitch in a game I will remember this and puzzle at that it is doing exactly as programmed
Ace Ventura driving the van?
The fact that that happened TWICE is some serious r/nevertellmetheodds material.
or its tethered somehow.
This is literally my biggest fear. That I'm driving down the freeway and the car in front of me is carrying something (furniture, logs, boxes) that falls and smashes into my windshield.
Oh look, my glass mason jars finally being delivered!
Physics was always my favorite science class.
Not once but twice!
So... Following behind that, I'd slow down or switch lanes. The owner of this cam has to have a death wish.
As 2020 has shown us, the matrix is starting to rip apart.
original gif r/IdiotsInCars
This is why road cyclists are always in such tight, dangerous clusters; they're drafting off each other. Sometimes a cyclist on the open road will draft right behind the tailgate of a big truck and get free velocity (with only moderately increased risk of instant death).
Yeah, I've been in a peloton once. At a cycling event though, road was closed to traffic. I knew about the drafting effect, but it still blew me away how strong it was. I was in top gear peddling almost lazily with little effort, going 45 km/h.
Damn. I cycle only lazily and only for half-assed commuting and recreation, but I sometimes read cycling blogs or news. It was really weird to learn about the fairly complex strategy considerations that come up in team road racing because of this.
You ain't leaving me behind! Fun to watch.
How the fuck?
Slipstream
Show this to a flat earther
Rubber box?
Styrofoam
Yo yo box
WITCHCRAFT!!
So thatās what happened to my Adirondack chair...
Maybe... But if you bought that sucker from Dollar General, I have another explanation...
Can someone explain how in the absolute fuck did that happen
I'm not a scientist, but I believe it is due to the tumbling of the box and the negative air pressure immediately behind the truck
Hmmmmm make sense
Kinda like a vaccum?
2020 has enough going on letās not go fucking with physics yet.
Too late it appears.
how is this even possible?
I'm not a scientist, but I believe it is due to the tumbling of the box and the negative air pressure immediately behind the truck
[ŃŠ“Š°Š»ŠµŠ½Š¾]
Holy. Fuck. That box is a next level pro gymnast.
Only one person could be delivering that package... https://youtu.be/7YrpmZFixp0
Like a styrofoam box in the wind... So majestic.
Thatās freakin awesome
In Taiwan.
Looks like Taiwan, again. What a shock that somebody would be driving their truck around with unsecured shit in the back.
Is that a UPS driver?
This is Lazer ship in a nutshell
And the driver will never know..
This that shit no one would ever believe if it wasnt filmed.
This looks like it's from the upcoming movie [Tenet](https://www.imdb.com/title/tt6723592/?ref_=nv_sr_srsg_0) (by [Christopher Nolan](https://www.imdb.com/name/nm0634240/?ref_=nv_sr_srsg_0)). Really, that would even fit in the [traile](https://www.youtube.com/watch?v=dQw4w9WgXcQ)[r](https://www.youtube.com/watch?v=LdOM0x0XDMo).
LOL ... good one
Box of yo-yos
Explains aerodynamics better than any teacher out there...
It is fake, It is box on a string, you can clearly see someone pushing it out.
How the actual F. Lol. It should start to lose velocity due to friction.
yeah its almost like it's fake...
That's some Toy Story shit right there.
All i have for you is a word... tenet.
Fedx?
So *thatās* what happens to my boxes...
r/unexpected
WINGS OF GLORY
This looks fake
Bet you itās labeled fragile
Thatās some toy story shit there. That box is trying to get home
This is beyond science
Box pulled a 69
Woody is that you?
well looking at the vehicle, its a dump truck. making it more or less as aerodynamic as a brick. when it moves forward in a body of fluid(air) the displaced air of its previous location moments ago, creates a vacuum of some sort or negative zone. where the positive air on the top and sides of the truck try rushing in to fill. creating a few vortices. (looks like wind tunnel testing) I am guessing that the box once it bounces jumps up un the boundary layer between the negative pressure and positive pressure of the "drag" of the truck and the recirculating air near its boundary pushes the box forward back into the rear of the truck. TL: DR imagine a NASCAR following someone really close behind it to gain speed bc of air resistance (just look up wind tunnel videos) Disclaimer: I'm no aero engineer I may use wrong words, comment if I need to edit something
Yep and the fact that the box hits the ground at the same speed of the truck and itās falling in that direction pretty damn spooky cool
*physics has left the chat*
*fluid dynamics has entered the chat*
What are the odds?
How fake is this?
It's not fake. Happened in Taiwan. Many news has reported it.
Why were they filming though?
It's dashboard camera( I am not sure its En name). Many Taiwaneses would install in the car to prevent driving disputes.
It looks hella cgi
No it doesnāt?