MMM_futbol

"Curve balls are usually attributed to the Magnus force," says Bloomfield. "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. The ball is pushed toward the low-pressure side. A similar drop in pressure over an airplane’s wing is the source of lift that supports the plane. “Although a plane’s lift is upward,” Bloomfield points out, “for a ball lift can be in any direction, depending on the direction the ball is spinning.”