The reason balls curve while in their air is because stitching, grip, and hexagonal and pentagonal shapes create drag across the top of the ball and as the ball is spinning and moving throughout the air, one side of the ball and its air adds to the air which is moving past it, having it go past the ball faster than the other side of the ball. Fast moving air relative to slow moving air creates a force which is against the side of slow moving air. An example is a cut strip of paper hanging down. ...
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