Bruce Lee's martial arts moves were skilled, tactical, and loaded with physics accuracy. Let's dive in. 📷: Getty
No one wants to deal with that many interactions. Instead, in physics we treat the ball as one thing—and that's mostly fine. However, to make sure that other people understand what we are doing when we model an interaction, we have to define our “system.” Perhaps, to make it easy, we decide the system is just the ball itself. If so, we deal only with the ball's momentum and any forces due to external interactions, and we can ignore all those atom-atom interactions.
It's also possible to have a system that consists of more than one object. Imagine a tennis ball attached by a string to a soccer ball. If I want to use a system consisting of both balls, then I would only look at forces due to external interactions. I wouldn't include the force the string exerts on either ball.
For the momentum of this system, I would use its total mass, which is the sum of the mass of the balls, and the velocity of the center of the system’s mass. Since the soccer ball has a larger mass, this center of mass would be closer to it along the string and farther from the tennis ball.Guess what? Humans are also made of stuff, and a person also has a center of mass. But the physics of humans can get messy, since they can change shape.
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