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The history of the pool is the same as billiards since the game did stem from billiards. In elastic collisions, the kinetic energy in the two objects stays the same. Some of the kinetic energy is changed to different kinds of energy such as heat, light, or sound energy. 1) On the break shot, a minimum of three object balls must either be pocketed, or touch the head string line, or a combination of both. You can determine play order however you want, but the official way to determine turn order in 8 ball is a lag for the opening break. The masses of billiard balls are the same, which can make some collisions close to elastic. The next time you play billiards, try using your new knowledge of physics and collisions. When a game has a three-foul rule, the referee should note to the players any second foul at the time that it occurs and also when the player who is on two fouls returns to the table. This practice and other similar practices are absolutely forbidden under the unsportsmanlike conduct rule, Rule 6.16(b). Players must never intentionally touch any ball in play except with a forward stroke of the cue tip on the cue ball.

As stated in Rule 2.2, balls other than the one and nine are placed randomly in the rack and should not be set in any particular order during any rack. In some games a player may choose not to come to the table in certain situations when play would normally pass to him, and then the player remaining at the table continues the inning (e.g. a push-out at nine ball). If a player misses his intended ball and pocket, and either makes the nominated ball in the wrong pocket or pockets another ball, his inning has finished and the incoming player has the option to take the shot as is, or hand it back to his opponent. Although some miscues involve contact of the side of the cue stick with the cue ball, unless such contact is clearly visible, it is assumed not to have occurred. Snooker is played using twenty-two balls, one of which is the striker ball, which is white. Table cushions should influence the speed of the table such that with placement of a ball on the head spot, shooting through the foot spot, using center ball english, with a level cue and firm stroke, the ball must travel a minimum of 4 to 4 ½ lengths of the table without jumping.

People played this game outdoors using wooden balls. Neville Chamberlain, a lieutenant, wanted to modify certain things about the "black pool." The game involves one black ball and 15 red ones. For example, if one object ball is pocketed, then at least two object balls must touch the head string line; or if two object balls are pocketed, what is billiards then at least one object ball must touch the head string line. It happens when the object balls have been racked and the cue ball is played from behind the head string usually with the intent of breaking the rack apart. In Vietnam, top players like Nguyen Quoc Nguyen, Ma Minh Cam, Nguyen Duc Anh Chien, and Ngo Dinh Nai have also opted for PBA. If this does not happen, then the opposing player must be given the option of either leaving the ball where it lies or replacing the ball as near as possible to its original position to the agreement of both players. If a dispute arises between two players in an unrefereed match, and the area referee is asked to make a decision without having seen the cause of the dispute, he should be careful to understand the situation as completely as possible.

After the break, the Ball Rack Template must be removed by the referee from the table as soon as possible without disturbing any of the balls. Exception to this rule applies if 1 or more balls are frozen and obstructing the removal, in this case the Ball Rack Template stays in place until such time that the frozen balls are no longer an obstacle in the removal of the Ball Rack Template. It begins when it is legal for him to take a shot, and ends at the end of a shot when it is no longer legal for him to take a shot. Details of the shot, such as cushions struck or other balls contacted or pocketed are irrelevant. Only one ball may be called on each shot, except on the break shot where no ball may be called. The player who wins the lag chooses who will break the first rack. It may be that a tournament is being played with "area" referees who are each responsible for several tables and there is no referee constantly at each table. Either player has the power to suspend play until he is satisfied with the way the match is being refereed.