Air pressure, spin, and curve balls

Bernoulli's principle that states if air on one side of an object moves faster than the air on the other side, that the air on the side of the slower air will create a "push" while trying to equalize the pressure by getting to the other side. This is why planes get lift, curveballs curve, and why the roof of your house gets blown off in a wind storm. Athletes such as baseball players know that spin is essential in changing the trajectory of an object. This is because when spin is created the air automatically moves faster on one side of the ball creating a push and throwing the ball off a straight trajectory.