The ball is pushed toward the low-pressure side. "When the ball is spinning, the air tends to follow a longer path around one side than the other, because it's dragged along by the ball's turning surface." Air following the longer path bends more sharply, resulting in a dramatic drop in air pressure on that side of the ball. "Curve balls are usually attributed to the Magnus force," says Bloomfield. You can really curve a beach ball without too much trouble." This effect shows up in volleyball, it shows up in golf. "Bottom line: a spinning ball deflects the air rushing by it and the air responds by deflecting the ball.
"It's the same physics for soccer balls as for all other curving balls," says Lou Bloomfield, a physics professor at the University of Virginia and author of How Things Work: The Physics of Everyday Life. So it isn't terribly surprising that little time is devoted to explaining just what's going on when Beckham bends a ball. Primarily, Bend it Like Beckham is about the challenges that Jess faces as she struggles with the expectations of her traditional Indian family and with the prejudices of British society.
The ball's curve, or "bend" in soccer jargon, can be devastatingly effective against an opposing team's defense. Among other things, Beckham (who happens to be a real-life soccer player with the Manchester United team in England, and one of the game's greatest athletes) has the ability to kick a ball in such a way that it executes a dramatic, sometimes uncanny, curve through the air. In the new movie, Bend it like Beckham, Jess Bhamra is a British teenage girl of Indian descent who dreams of playing soccer the way her hero, David Beckham, plays it.
0 kommentar(er)
