The objective of this lesson is to illustrate how a common everyday experience (such as playing pool) can often provide a learning moment. In the example chosen, we use the game of pool to help explain some key concepts of physics. One of these concepts is the conservation of linear momentum since conservation laws play an extremely important role in many aspects of physics. The idea that a certain property of a system is maintained before and after something happens is quite central to many principles in physics and in the pool example, we concentrate on the conservation of linear momentum. The latter half of the video looks at angular momentum and friction, examining why certain objects roll, as opposed to slide. We do this by looking at how striking a ball with a cue stick at different locations produces different effects. Though not required, students who have been exposed to some physics would benefit most from this video. In mathematically rigorous classes, students can concentrate on the details of vectors and conservation of linear momentum. No materials are required for this lesson, and it can be completed easily within a class period.

这节课的主要目的是说明一个普通的日常生活经验（比如玩桌球）是如何能够提供一个学习机会的。在这个选好的例子中，我们通过玩桌球来帮助解释物理学中的一些重要的概念。这些概念的其中之一就是线性动量守恒，因为守恒定律在物理学的许多方面发挥着极其重要的作用。一个系统的某个性质在某件事发生前后保持守恒这个概念对物理学中的许多原理以及我们这个桌球的例子至关重要，我们主要讨论线性动量守恒。视频的后半部分提到了角动量和摩擦力，讨论了为什么某种物体滚动而不是滑动。我们通过用球杆击打一个球的不同部分来说明击打的球的部位不同产生的效果就不同。虽然不作要求，学过一些物理学知识的学生最能够从这节课中得到收获。在对数学要求较高的课堂里，学生们可以集中在向量和线性动量的守恒上。这节课不需要其他材料，可以在一节课的时间内轻松完成。