A hook in ten-pin bowling is a ball that rolls in a curving pattern (as opposed to straight). The purpose of the hook is to give the ball a better angle at the 1-3 pocket (right-handers) or 1-2 pocket (left-handers.) to achieve a strike. When a ball is rolled straight, hitting the pocket must be precise. By hooking the ball, the ball will hit the pins with more force, producing better carry - especially on the 5-pin during a strike ball. Straight roll - even when it hits the pocket, will tend to leave a tap such as the 5-pin on a light hit, or the 10-pin if the ball was just slightly right of center pocket or with inadequate entry angle. A hook ball can achieve strikes with less precise hits.