If the cue ball is rolling forward at contact, the outgoing angle compresses to approximately 30° relative to the original direction, known as the . This is critical for position play.
Standard bank shots rely on the principle that the angle of incidence equals the angle of reflection—though factors like cushion "mushiness" and ball spin can alter this slightly.
Striking the ball above its center creates forward rotation. After hitting the object ball, this forward momentum fights the 90-degree rule, causing the cue ball to curve forward ("follow") the object ball.
Calculations of friction coefficients, collision angles, and momentum transfer. the physics of pocket billiards pdf
When you cut a ball (strike it off-center), two hidden effects change the outcome:
: When a cue ball hits an object ball, the collision is nearly elastic, meaning kinetic energy is mostly conserved. Conservation of Momentum
At its core, billiards is a game of energy transfer. The most fundamental principle at play is the . Momentum Transfer If the cue ball is rolling forward at
Look for that focus on technique rather than equations. Compare this book to Dr. Dave's more modern resources. Which direction would be most helpful for your game? PHYSICS POCKET BILLIARDS, Reviews & Ratings - Amazon.in
If you are looking for a downloadable resource to keep by the table, search for standard academic guides on to find formatted charts, mathematical proofs, and vector diagrams detailing these exact principles.
When you strike the cue ball on the left side, the tip pushes the ball to the right of your aiming line. This horizontal displacement is called or cue ball deflection . Striking the ball above its center creates forward rotation
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 table’s felt is not just a surface; it’s a force of physics known as . The cue ball doesn't roll purely from the beginning. After being struck, it initially slides across the cloth. The friction between the ball and the felt then acts to slow this sliding and, depending on the spin applied, will convert the motion into pure rolling.
If the cue ball strikes the object ball without "throw" (skidding induced by spin) and without significant surface friction during contact, the two balls will depart at right angles (90 degrees) relative to each other.