Two distinct friction regimes control the table:
Friction between the two balls during impact can "pull" the object ball slightly off its geometric path. Advanced players compensate for this by aiming a fraction of a millimeter away from the true contact point. 5. The Coefficient of Restitution the physics of pocket billiards pdf
Striking the ball above center causes it to rotate forward faster than its travel speed. After hitting the object ball, this "over-spin" overcomes the 90-degree rule and pulls the cue ball forward. Two distinct friction regimes control the table: Friction