By using the 90 degree rule when shooting pool you can make the cue ball follow along a tangent line to determine perfectly where the ball will go and prevent scratch. The cue ball follows the path of the object ball and is deflected off the rail setting up the next shot.
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Billiards & Pool How to Prevent a scratch in pool using follow

By dmcknight
Nov 28, 2007 11:47 PM


Prevent a scratch in pool using follow
Click through to watch this video on colostate.edu
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www.engr.colostate.edu
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