100 thoughts on “How SMOOTHNESS of a SOCCER BALL affects curve!

  1. Can you provide a link to the "Tracker" application? The name is so generic that looking it up gives you contextless stuff.

  2. @Physics Girl: This has been quietly nagging at my mind for months.
    Doesn't your analysis imply, by the Intermediate Value Theorem, that there is some surface which will NOT experience either Magnus or reverse Magnus effect?
    I would really love to see you show a ball that never curves. This sounds crazy to me, but also seems implicit in your explanation.

  3. you make a regular soccer ball make weird movemnts we call it a Knuckleball its when the ball has no spin or very very little spin that the aero dynamics will react to it.

  4. Wait… that background painting or puzzle, whatever it is.. Thats the place the new csgo map canals is based from, right!?

  5. yeah i noticed that..i didn't know why when i was yonger the ball whent the wrong way but then i tried the same ball and it spined the wrong way.

  6. Need help: i was writing the italian subtitles for this video but i can't understand what "plates" mean in the sentence at 5:07 (more or less)… Can someone help me in figuring this out? maybe with an image.

    Sorry but i cannot understand it and the translation i thought doesn't fit in that context.

    Thanks and have a good day.

  7. Diana, Thanks for this analysis – great work! I'm using Tracker with my students too 😉
    One question: Is the 2:39 shot showing the opposite effect, not the one described seconds before 😉 (should be the orange ball, deflecting towards dashed line – isn't it?)

  8. What were the wind direction and temperature at the time of the experiment? Did these parameters change between kicks?

  9. LOL Eurocucks getting triggered by the word "soccer". USA has owned you atheist trash since WW2, so get over it and start worrying about the muslims you're being overrun by, they're all obsessed with girly soccer too, what you think USA is going to save you this time? #LOL

  10. It also can happen if the mass of the object is lighter the air is transferred in one direction while other is on the other direction.

  11. Great! Thanks for the video.

    I have been trying to understand how Magnus effect works on 'paper flying tubes'- when thrust forward with clockwise spin from throwers point of view, it gets lift as well as lateral turn, ofyen to left and sometimes to right. I cant figure out how the forward going spinning tube deflects air to get such a trajectory. Can you do a video on that please?!!

  12. Awesome! As a lifelong soccer player and official I've always wondered about this… Your explanation nailed it, and was easy to understand. Thanks!

  13. What caused the oscillations between normal and reverse imho is that it sometimes rotates parallel to the rubber band, that is, the rubber band is like a rotating disk, and some other times, its rotating parallel to the rubber band circular surface, like a rotating coin. The first one is laminar, the second is turbulent

  14. is this similar to what is going on when you curve a bowling ball? Or is the friction of contact to the surface of the alley going to change whats going on?

  15. Next idea. Table tennis with a bouncy ball. It will reverse the spin every bounce, so you can make it go zigzag and if you give it back spin, it will bounce straight up and then when the other player moves in, it shoots forward (sometimes in the face)

  16. I gues i am too late, bat heare some examples of courve, side courve, top speen, all together…

  17. There's Cricket, another sport where both Laminar and turbulent flows are used at the same time. Consider digging deeper in that, it's much intriguing!

  18. As usual.. explanation is misleading since people do not talk about forces. Rotation causes difference in pressure.: in other words LIFT FORCE. And iinverse Magnus effect is STALL

  19. i've been playing with soft balls at home and I WOULD GET FRUSTRATED every time the ball acted differently. THANKS to this video now i know why this has happened

  20. For the anti-"soccer" purists: the name football was used as far back as the Middle Ages for what is now called "mob football," which had no rules and involved two large groups of people trying to move the ball into goals a long distance apart. Nothing prevented you from using your hands and indeed carrying the ball (other than the fact that you might get trampled by a mob of opponents). The "foot" part refers to the fact that you played on your feet and not on horseback – a very important distinction at that time, as it marked football as a game for the masses and not the equestrian elite. So, no, "football" does not actually mean a game dominated by kicking. It just worked out that way in Association football/FIFA football/soccer – a happy verbal accident.

  21. But that doesn't happen witha regular football irrespective pf how smooth it is…..the 2nd ball here is so light weight

  22. Cricket ball swing has complexities due to the relative weights and smoothness of the sides of the ball

  23. how about kicking a soccer ball with no rotation. does this eliminate the magnus effect? does it encourage laminar flow? i have been spending the past few years learning how to kick a soccer ball with minimal to zero rotation and am noticing things i cannot explain easily. please help.

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