The — Physics Of Pocket Billiards Pdf ((free))
In the absence of side spin, the cue ball will always travel at a 90° angle to the direction of the object ball after a collision, provided the object ball is struck anywhere other than center-to-center.
Most ball-to-ball impacts in pool are nearly elastic , meaning kinetic energy is conserved and the balls bounce off each other with very little energy lost to heat or sound [18].
No collision is perfectly elastic. The coefficient of restitution (COR) for billiard balls is about 0.85–0.90. This means a small amount of kinetic energy converts into heat and sound. In practice, this is why a ball slows down slightly after bouncing off a rail. A dedicated would include tables of COR for different ball materials (phenolic resin vs. polyester) and rail rubber compounds. the physics of pocket billiards pdf
Woolen cloth has a directional nap. Balls roll faster along the nap (toward the head rail) than against it (toward the foot rail). This affects slow-roll shots.
Understanding how friction affects a "stiff" or "soft" table allows you to adjust your speed control instantly. Key Takeaways from The Physics of Pocket Billiards: Spin changes the collision angle (Squirt/Deflection). In the absence of side spin, the cue
: When balls collide, they exchange kinetic energy. These collisions are nearly elastic , meaning most kinetic energy is conserved rather than lost to heat.
A modern classic by a physics professor, with clear illustrations and "Technical Proof" documents for deeper dives. His website, DrDavePoolInfo.com, is an invaluable resource. The coefficient of restitution (COR) for billiard balls
by Wayland C. Marlow. This is a highly technical, mathematically dense text filled with vector equations and rigid-body mechanics formulas.
For a rigorous treatment with equations, diagrams, and experimental data, refer to the canonical The Physics of Pocket Billiards by R.G. Jewett or the online resources of Dr. Dave Alciatore (the “physics of pool” expert).