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Second, the phrase "equal and opposite" shows up in two distinct contexts
that are easy to confuse.
I do as questions like this on multiple choice tests. But I warn students
in advance and then again on the test itself, in the text of the item: I am
not asking you to identify an equilibrant but rather a "reaction" force as
required by the third law.
From a physics point of view, these are two different things, i.e.two different /dynamical interactions/ ... but from a mathematical