Jabulani Football Physics - Sixty Symbols
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- čas přidán 29. 06. 2010
- We discuss the Jabulani (official World Cup football) which has caused so much debate - and a few of our scientists take it for some field testing! More videos at www.sixtysymbols.com/
With Philip Moriarty - Věda a technologie
At 01:37 the most important question is being asked! I remember sitting in my Aerodynamics class and reading about the air flow around a sphere, and having the same question. The answer that the gentleman gives at 01:43 is very, very, very important.
Brilliant video, thanks. I love the total lack of football skills evenly distributed throughout the team :D
look again?
@4:09 he says coefficient of restitution is ratio of heigh bounced back at and drop height, when it is actually the square root of that!
some of those shots were pretty good
Clewett may be the only person who's ever apologized for having a vuvuzela.
But they all should. ALL OF THEM.
You guys could get away with anything..."Are they bludging over there?" "Na, they're working, they have their lab coats on."
I love how excited they get teaching physics, it's brilliant!
For the magnus effect, try a meterstick. If you spin and throw it about 6 meters high, it spins back to earth and makes a whirring sound! The net displacement is something like 2-3 meters horizontally from the maximum point of the ruler.
Daammnn I have learned more about physics than in any other lesson from this 10 min video... Great stuff
fluid dynamics problems are generally solved using emperically determined formulas and tables based on a couple of dimentionless numbers. Reynolds number most importantly indicates just how turbulent the flow is and is function of diameter, speed, viscousity and roughness of the surface.
another kickass video. nice work.
i'd be so happy to learn from these teachers
I don't remember the name of it, but there used to be a ball made before the jabulani that looked like it but that everyone liked.
I don't think people worry their eyes will pop out. The natural reaction before taking a blow to the head is to close your eyes to avoid direct impact. Should be a hint that you shouldn't be stopping a football with your head.
I liked the explanation lads. I would imagine that Adidas thought about all that stuff before launching a new ball for the world cup right?
You missed the most important part of the issue with the Jabulani. That is when the player does not put spin on the ball. When you spin it, it will get a predictable trajectory, but when there is no spin it can wobble in an unpredictable way due to random pressure or eddies. Several of the goeal in the WC looked like keepers mistakes, but was in reality shots without spin and thereby a wobbly ball. It can easily move a halv metre or more out of it "normal" trajectory, making the keeper miss it.
i want to play football with you guys
@StringsCrusader it's not too advanced, it's just a different design that the players aren't used to
@FrostPegasus Actually it was supposed to be against USA but they managed to find the tricks on the ball such as beating England and being able to score a disallowed goal against Slovenia
it would be interesting to see in a controlled environment, where wind is constant (i.e. indoors gymn) and the kick is automated mechanically to see the difference between previous soccer ball and this new type of soccer ball
I also know that the balls moves a lot when kicked to the goal, so the goalies need to be focused in the ball first and then think what they're gonna do later... I think the goalies mistakes that we saw in the World Cup is because they wasn't focused in the ball's movement and conditions like watery grass.
give it to Roberto Carlos. He knows what to do
He would’ve launched it to the moon
he won't. that's the whole problem. it doesnt respond to swerve, curve and spin
Nice video. What camera did you use when you recorded the football-clips? Thanks.
always knew bending the ball had to do with aerodynamics and such but very enlightening to watch first thing when you wake up. Get you thinking about many random things!
@llSBGMSSll segun yo, como tu dices, es la poca resistencia por no haber costuras y la poca cantidad de paneles. ademas, los problemas empezaron desde el teamgeist, el balon que usaron en alemania 2006…
@Ph0Xy It's because the ball is made with less panels. This ball only has 8 panels while other balls have tons and tons of panels.
this is why we see so many crosses going to way too far, and way too high bounces, but we have seen quite a few intances of swerve lately. great video guys
the danish did a test of it in a japanese wind tunnel, and found the same, even FIFA cant argue with japanese technology :P
I think it's also how you get swing with a cricket ball. The roughness on one side creates turbulance and thus a pressure difference. Lower on the rough side and so the ball swings away from the shiny side.
Also the seam.
Check out the vide, core stability and balance will help control the ball better on the swiss ball
Okay so does this mean that you can actually exert less force on the ball to get it to fly the same distance?
in which website can I order vuvuzela and jabulanin ?? please answer
hey, don't underestimate us footballers, I know my physics...
So you say that a good practice for footballers is to play with different kinds of balls for better control on it?
Cool!
Omg I think it's the first time we get to see Brady ;)
I think it'd be interesting to see this ball in a fluid dynamics chamber like the one at NASA that Mythbusters have used many times!
Nice kick Brady, I see you have played a game or two of soccer/football.
the best explanation why the fifa wc ball is reacting bizarre.. and i got to know the importance of fluid mechanics!! iv been studyin it.. but i never gave a shit to it until now!! thnx a lot for this video
@Tarantulicx they arent saying that it is bad, they are saying its is different the athletes dont know how to handle it yet it has less drag, etc so it flies higher curves easier it is better its just the players aren't used to it.
@SaucyMcSaucer are you talking about the teamgeist ?
they should put large divots on the surface of the ball, like a golfball.
I like the extra touch that they had different color lab coats for the different "teams" and even for the goalkeeper 😁
See also the video on numberphile about the shape of the original football. I forgot the name of it
Ok now can you do a video on swing bowling? :D
yeah. agree with you man. If ppl said sth is not working just because of lack of scientific researches BUT it's affective enough for you, just DO IT!
~Arnold Schwarzenegger
i love physics and football!!!
We should use again the balls we used on 2002( Fevernova) and 1978 (Tango)
Watching them play football, is like watching my 8 year old brother play....
@johnmacward ahah man he's really passionate! he can't even stand without swinging!
There needs to be a Nobel prize for humor.
I was a football player and I was fairly aware of most of the physics concerning the movement of the ball and how to get an advantage from it.
Great!
if against is up and with is down then that would make 1+1=0 and 1-1=2 so, in that logic multbulls divide, factals multiply, if contained becomes a solid until functions around it happen first neat
fits your name.
Wasn't 2006 the first year they had a vastly different type of ball, and players were complaining about it back then too? Also, NBA experimented with a similar type of ball but the players fought back enough that they only played a few games with it.
We, Brazilians, demand a new video about the new ball. Take a look at our balls.
your balls have been working nicely. cheers
I think you'll need a doctor for that mate
Andres .C lol
I bet 7 to 1 that the Jabulani is better.
@walshygel2 yes it is a vapor there for fluid
watch the over sixty symbols (etc) videos. they are just having some fun, but are some really bright people
All teams practice with these balls long before the matches too. if they are pros they would understand directly after hitting the ball once that it goes further and so on. The goalkeepers in the other hand. I feel sorry for, as the ball could suddenly change direction. Which isn't possible to practice to understand, as NASA proved it to be "random" wether it would go abit to left, right, up, down etc etc.
But BOTH teams plays with this ball and both have been practising with it.
0:26 Young & Freedman in book shelf
oh, so did the ball change every time England's opponent touches the ball? cause i think it was allways the same ball
wish i had this video at university
people need to adapt to the ball not the other way round they see the ball flies straight up in the air for a free kick but they dont change their technique in order 2 score... look at forlan his tekkers looked dodgey but most of his freekicks were on target
how much do you want for the ball
@mynamemygirl I understood him perfectly and im stoned.
I should say really stoned because i had to close one eye so i could focus on the screen.
Great vid and explanation btw
Yes us footballers understand the physics and parabolic trajectory manipulation..
what we want to know is.. how did you screw up our game with 6 years of R&D
Then again, they consider a gas as a fluid as it is studied within mechanics of fluids. Take a seat belt before reading this:
Fluids are a subset of the phases of matter and include liquids, gases, plasmas and, to some extent, plastic solids.
Bingham plastics they're called; such as toothpaste, mayonnaise, chocolate, and mustard.
@ajrangar No it looks like the jabulani but has a different name. i think it starts with a "c" but whatever
One thing I am failing to get: according to Bernoulli's law the higher the speed of the fluid, the lesser the pressure. So why did the object prof. Moriarty launched was lifting up, if the pressure was supposedly lower underneath it?
Nevermind, I got it right finally. Just for the sake of clarity, the lower side has both the air it meets and the one it drags around with it due to viscosity. Given the direction of the flight and the spin, the two flows of air sorta cancel out on the lower side while summing together on the upper one instead, making the overall flow of air over the surface faster on the upper, diminishing the pressure according to Bernoulli's principle.
He did say "a greater pressure distance here than here" when first he indicates the bottom and second the top
Yes that I can see, I was failing to understand why would air be faster on the upper side.
Speed of air underneath the cups was lower than it the speed of air above the cup. So pressure was higher under the cup and that was causing the lift.
I replied to myself explaining I got it XD this comment section sucks bad time.
4:14 it's called knuckleball
geez they're just explaining the physics behind this ball and people are raging about how england is shifting the blame towards the ball >_>
@soulesschain411 of course i understand those simple theories, it just that his accent will cause a problem for people who don't initially understand those theories.
you change the ball but keep the Referee ?
wondering how I can bring this information in to my golf game
A golf ball has dimples that help it fly further. Try hitting it a little off center: above center to make it dip; below center to make it float; left/right of center to make it swerve right/left respectively. Keep your eye on the ball and don't press.
@RobertGreenGoalie
I think you should see it as a challenge, and try to work around it...you know, challenge your hate for it in productive ways. If I were you, that thing would just make me more ambitious to try and stop it.
@RobertGreenGoalie If this is your justification the other keepers were stopping the same ball.
Bend It Like Reynolds
I love this ball.
I miss it soooo much
Forlan knows this!
I didn't know that James was an organic chemist
@EverthingYouNeed well ur username lives up to expectations!
Van Bronckhorst would disagree.
@justinkatz44
Well when they are playing to impress their whole country, a lot of pressure is put on them to win...
Having something like this that would throw off their game isn't something they want to deal with but they have.
@stabilini its just a game, everyone can have fun.. dont be like that
wow.. .I wanna have that ball. .:D
Thumbs down for misleading. Only briefly is the difference between the Jabulani and a regular ball touched upon. The title and linksbar made the video appear to show the special effect of drag of the Jabulani, and not just of any object, of any kind of shape.
do these sixtysymbols guys hang out with James and all the numberphile dudes?
This dude should check out Smarter Every Day Episode 112.
Grant Imahara @2:50?
Side observation...surprised to see university faculty heading the ball. You make your living using an inelastic organ, and you're going to smash that organ against the side of your skull? Seems like a bad move.
Here's an idea for an experiment: compare the forces of a kicked football and a punching boxing glove. Might give some pause for thought.
I think adidas should give this guys a call!
Coupled to the cups. Or cupled.
God I love physics :)
i exactly know how every ball reacts. I know how much power and curl i put in my free kicks and know my distance between me and the goal. so don't be saying we don't know our physics
I think you would still need a little practice with the Jabulani, or any radically new design, to understand (get a feel for) how it reacts. Even if you know your physics and football (as I do).
2 cups, 1 Ph.D.
this should have more likes
@kamuolinis i already do
Really internsting short film about jabulani, but did anyone notice how they missed every single shot? :D
some of the explanations are flawd
@KerriMF101
Yeah, and he's wearing green clothes!:D
Even sounds like a kid's ball
I am from loughborough uni :D
A fluid and a liquid are not the same thing. Both gases and liquids are fluids.