Chapter 6 Louis Poinsot and the Dancing Spheres

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Early in the education of every mechanical and civil engineer comes a period of long and detailed study into how forces cause things to move or not move. When you’re talking about a car or an airplane, you generally want those forces to make the vehicle move—the general term used to describe this field of study is called dynamics. For a bridge, a cell phone tower, or any other object that you don’t want to move, you turn to the study of statics for understanding.

Any real-world object can have a multitude of forces and loads acting on it, and those forces have technical names such as tension, ...

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