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A comment on A New Theory for Systems That Defy Newton’s Third Law. Parent comment

Re:A New Theory for Systems That Defy Newton’s Third Law by bodhiandphysics on Sunday November 14, 2021 @06:17PM (#29221709)
I meant the infinitely massive box of physicists dreams. Translational symmetry is broken by the boundaries of the world
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Re:A New Theory for Systems That Defy Newton’s Third Law by nextaccountic on Monday November 15, 2021 @04:27AM (#29225446)
You mean, a box that is immovable because it has infinite mass?

Hmmm I don't get it. What boundaries, the box boundaries? How does it break translational symmetry?

Anyway in this case I think at least elastic collisions will still conserve momentum, eg this https://en.wikipedia.org/wiki/Elastic_collision#/media/File:... conserves momentum even if the box has infinite mass.

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