There are several books available that discuss the physics of balls oncloth struck by pointed sticks. A fairly non-technical treatment is inJack Koehler's \"The Science of Pocket Billiards\". It has many goodobservations and plausible explanations but no real theory orequations. For the latter, get Wayland Marlow's \"The Physics of PocketBilliards\" which has great steaming piles of equations. Marlow diedin September, 2002A 100-page online discussion is in Ron Shepard's \"Amateur Physicsfor the Amateur Pool Player\" available at the download section ofPlayPool.com at and at _apapp.pdf Also available atplaypool.com and at _squirt.pdfis Shepard's 19-page analysis of the causes of squirt. Theseinclude theory and equations and diagrams, along with usefulworked examples. If you have access to a college physics library, many \"mechanics\" textsfrom around 1900 have entire chapters devoted to billiards physics(Williamson or Routh). The granddaddy in this field is a 176-page bookby Coriolis (1835) in French. It has recently been republished byJacques GABAY in Paris, ISBN 2-87647-081-0. A recent book in French is\"Billard - Theorie du Jeu\", ISBN 2-7027-0573-1, by Regis PETIT,published by Editions CHIRON/CASTEILLA, 128 pp., price: 98FF. InCanada, available from PROLOG (Bois-Briand QUEBEC), for $31.95 Itcontains material for the player as well as the theoretician.Some results of recent measurements:The tip is on the ball for about one thousandth of a second. Duringthis time the ball moves no more than a few millimeters on a typicalshot. It is unlikely that the grip hand can have much effect on theshot during this brief time. The tip has only one contact with the ball.The fastest cue ball reported (shot by a martial arts student)was about 35MPH (15.6 meters/second). More typical break speedsare around 20MPH. The energy in the ball goes up with thesquare of the speed, so the first is about three times asenergetic as the typical break.
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