In this episode, Jack and Mark talk about the concept of a physical interaction. They discuss Isaac Newton's Third Law of Motion as fundamental for students of physics to understand. The Third Law explains how physical interactions work. Namely, that forces always occur in pairs with equal magnitude and in opposite directions on the two objects of an interaction. The audience is invited, along with Mark, to test their understanding of this concept through a series of scenario-based questions posed by Jack. It's through these types of examples that most students come to be proficient at identifying forces found in interactions. The podcast concludes with discussion of the impact Newton's ideas had the science of his day and how they continue to be important in today's world both practically and philosophically.

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