There are five phases of ball motion: skid, hook, hook out, roll, and roll out. The ball skids because it is in the oil and can't find enough friction to hook. Once it finds enough friction, it begins to hook. When the hook is complete, it stops hooking and begins to roll, once it begins to roll (point of maximum energy), it starts losing energy (rolling out). The idea is to get the ball to roll just before it reaches the pins so that it is at the point of maximum energy.
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