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A knuckleball's movement principales are very much the same w as a curveball. The less spin on the ball the more it moves-tghis also accounts for the ridiculas speeds at which it travels.
Now, the ball is travelling forward at 60mph. The air resistance on the ball is varied depending on where it is. At the stiches the air is going to travel around the ball slower, causing the ball to rotate slightly. As it does, it moves and changes direction. However because it has rotated only slightly the same thing happens to the opposite side of the ball. Making it change directions again, the other thing that makes it so hard to hit is that, with the constant change in speeds and direction, the ball sinks aswell. These thing are why the knuckleball is so hard to hit and even pitch, as the pitcher does'nt even know where its going!
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