3 ms·
Speaking of cheap balls: when you banana kick a soccer ball with a counter-clockwise spin, it will bend leftwards. If you do the same with a cheap, thin beach b
by kleiba 16y ago
Speaking of cheap balls: when you banana kick a soccer ball with a counter-clockwise spin, it will bend leftwards. If you do the same with a cheap, thin beach ball, it will bend rightwards. What's up with that?
- perlgeek 16y agoI play table tennis, and thus have quite a bit exposure to small, cheap balls. I can't confirm your observation.
- 30thElement 16y agoIf you assume inviscid potential flow, a cylinder rotating forward will create lift. So the counter-clockwise spin on the cheap beach ball is creating lift on its right-hand side, so it curves that way. As to why a soccer ball curves the other way, I'm guessing that it's because soccer balls tend to tilt a little, and since they are rotating about that tilted axis, friction pulls them to the left. Even if the same thing happens to the beach ball, it's light enough that friction is small to begin with and the tilt is gonna lift the ball, decreasing friction even more.