Why internal forces never change an object's overall path
In short: Understanding how objects move requires looking past their individual parts. This video explains the concept of the center of mass and why internal actions, like a person walking or a wheel spinning, don't affect an object's linear trajectory.
Paul Andersen explores how to measure the linear motion of any object by focusing on its center of mass. A key principle highlighted is that internal forces—forces acting within the boundaries of an object—can be ignored when calculating overall motion because they exist in action-reaction pairs.
The video also provides a practical method for identifying the center of mass in irregular objects, making it a useful tool for both theoretical physics and everyday mechanics.
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Sources
- Summary by Intellect · source: Motion of the Center of Mass
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