Xiaoqiang is a doctoral student in mechanics and a popular science writer. In his spare time, Xiaoqiang always asks Xiao Ming for knowledge, while Xiao Ming always gives him satisfactory professional answers.
"Ming, when playing billiards, the white ball hits the red ball, why does it produce different results? Sometimes the white ball will rebound back, sometimes continue to walk, and sometimes even stop at the impact point. Also, why do different speeds hit the edge of the ball table and the rebound angle are different?" "This question is very complicated, and you need to learn high school physics before you can understand it in detail." Xiaoqiang was very disappointed when he heard Xiao Ming's words.
"However," saw Xiaoqiang's lost expression, Xiao Ming smiled slightly, held his glasses and said seriously, "I can tell you a little bit. When the white ball moves forward, it carries a certain amount of energy. After the collision, the speed and direction of the two balls are related to the speed, the collision position and rotation of the white ball before the collision, so you can see various different situations, and the same principle is also the impact on the edge of the ball table."
"So complicated!" Xiaoqiang sighed, "Billiard players still have to master the knowledge of mechanics to play, it is not easy!" The principle of collision is indeed very complicated, but billiard players play by experience. They judge the position and rotation of the collision through long-term practice, as well as the action of the action. Due to the characteristics of billiards, billiards are also called "It is difficult for mechanics to master this sport, but it does not affect the popularity of billiards in all countries around the world. In the process of the development of billiards, different countries have also developed different forms of billiards. Our common billiards are all bag-like. After impact, the billiards are scored. Such billiards are called bag-like billiards. In addition, there is also a kind of Kailun billiards that have no mouths
If classified according to the rules and methods of play, Kailun billiards are different from other billiards because of their uniqueness, and are a relatively rare form. Common rules of competition include snooker billiards, 8 balls and 9 balls. Among them, snooker billiards are the most popular men's billiards. Its table is larger and the ball is smaller. There are 2 colored balls of 8 colors on the whole case, including 1 white ball and 15 red balls, each with 1 point. Yellow balls, green balls, color balls, blue balls, pink balls, and black balls. 1, 2 to 7 points in turn. When playing, you should first hit the red ball. If the red ball is hit, hit other colored balls, and then hit the red ball; if one side hits the ball in the middle, the ball will be exchanged.
Compared with the complex rules of snooker, 8 balls are much simpler. In addition to football, there are 15 colored balls on the table. Both sides hit their respective balls. If they are not in the pocket, they will exchange the ball rights until they are taken. The square ball and the black No. 8 ball have been played. Currently, this is the most popular billiard ball in the streets and alleys. 8 balls are divided into European and American styles, and the rules are slightly different.
There is also a type called American 9 ball, which is larger than other types of billiard balls. Both sides of the game have to start from No. 1 ball to No. 9 ball, who makes No. 9 ball fall into the bag to win. 9 ball is a relatively popular event for women's billiard balls in the international world and has also been widely recognized in the United States.
