When the fluid comes contact with the upper side of the ball, the speed of air increases because the speed of ball adds to the speed of air(As the flow of fluid is in the same direction of spin). ... A spinning ball or cylinder curving away from it's principal flight path is called Magnus effect.Sep 3, 2015 read more
By causing the ball to spin forward relative to the flight oftravel, the ball will create a lower pressure zone above the balland the ball will rise up at the expense of losing energy morequickly. By causing the ball to spin in other directions relative to thepath of flight the ball will fly accordingly. read more
Stay in the air longer, no Human can make a ball actually curve upward in flight) you’d want the ball to spin as though it were rolling toward you. And of course, you can also make the ball veer left or right using the corresponding spin. read more