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Physics 13 Online
OpenStudy (anonymous):

Explain what is meant by a reference point and why motion must be described in terms of one.

OpenStudy (anx):

Reference frames, I beleive is the term you're looking for, but its basically a coordinate system used to measure properties of an moving object. Everything in physics is in somesort of motion, so its necessary to understand which object you're trying to describe.

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