We see a lot of examples of converting between linear motion and angular motion in our daily life. But, is the conversion between linear momentum and angular momentum possible? If so, where have the conservation law of linear momentum and the conservation law of angular momentum gone? If not so, how can I understand the phenomenon such as this. A billiard ball that has high angular velocity and low linear velocity is collide with the cushion and bounce off with low angular velocity and high linear velocity. Thanks.