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N2: I don't understand. If N2 defines force, how do you measure mass?
What do you do to compare other chunks of matter with your "specific chunk"?
N3: Again I don't understand. In a closed system there can be no external
forces. To identify a force that is acting I must isolate a part of the
system. N3 guarantees that in the process of isolating, I don't leave any
unbalanced force that would result in a net force acting on the closed system.