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Is every action a reaction?
(kbin.earth)
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this post was submitted on 20 Jul 2025
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I get the confusion, but a reference frame is a very important limitation for calculating what you need. Its not about whether the arm exists behind the hand, but whether its effects are important for the calculation.
For the sake of the hand pushing the ball, its not. Only the momentum of the hand and the inertia of the ball are important.
I understand very well, and also understand anyone with the capacity will understand the frame of reference doesn't explain the phenomenon. It's how we went from four corners to heliocentrism to galaxy, universe, and multiverse.