Å·±¦ÓéÀÖ

“Michael Berry wrote a paper called Regular and Irregular Motion. He determined the predictability of the path of a struck billiards ball. The path after the first impact is easy to determine with basic geometry. The second path is a bit harder, but still relatively easy. By the 9th impact Berry determined that the gravitational pull of a person standing next to the table had enough of an influence on the ball path that it was necessary to be included in the calculations.”