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The branch of mechanics concerned with the relationship between motion and the forces that affect it—essentially, what most people simply call "dynamics." It's the study of how objects move when forces are applied, encompassing everything from a falling apple to a rocket launch. Dynamic mechanics asks: given these forces, what will the motion be? Given this motion, what forces must have caused it? It's Newton's laws in action, the physics of why things go where they go when pushed, pulled, or thrown.
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