The journey through the physics of pocket billiards is often framed as a battle between the chaotic unpredictability of the human player and the rigid, elegant laws of geometry and motion . The Silent Mechanics of the Table

: As noted by physicist Gaspard Coriolis in 1835, the cue ball does not always travel in a straight line. Because of friction and spin (top or bottom), its trajectory is actually parabolic until it stops sliding and begins to roll naturally.

Friction between the two colliding balls transfers some of the cue ball's spin to the object ball. This can slightly alter the trajectory of the object ball, pushing it offline. 3. Rail Cushions and Vectors

: When two balls collide, they don't just bounce apart. Friction creates a "rubbing" force that can "throw" the object ball off its expected line by as much as six degrees.

If you’re compiling your own PDF, ensure it includes high-resolution vector diagrams, a glossary of terms (squirt, CIT, COR, etc.), and practice drills that test each principle.

Advanced players fear squirt—the deviation of the cue ball’s initial path when using side spin. When you strike off-center, the cue tip applies an impulse not aligned with the center of mass, causing the ball to "squirt" opposite the spin direction.

The Physics of Pocket Billiards by Wayland C. "Skip" Marlow is widely considered a for anyone deeply interested in the technical mechanics of pool, though it is geared more toward the mathematician than the casual player. The Breakdown