In the 1997 world cup, Roberto Carlos scored a superb goal by shooting in a direction different from the one of the goal, but the ball span to the left and entered the net. How do you explain this achievement biomechanically?
This spin creates the Magnus Effect with drag and lift forces. This sidespin would cause this ball to change its direction to the left.
When a ball is spinning, one side spins towards the direction of motion and the other spins away from the direction of motion.
The side spinning towards the direction of motion slows the air and increases the air pressure, while the other speeds the air and decreases the air pressure. So the ball is pushed away from the side that spins forward.
Is this solution good? If not, please correct me.