The origin refers to the specific reference point from which distances or coordinates are measured to determine the position of an object.
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The position of an object is described relative to the chosen reference point. Different reference points may yield different coordinates or distances for the same object.
Specifying a reference point provides a consistent and clear frame of reference from which the position of an object can be measured or described.
Straight-line motion will be described using simple equations and graphs. Later, the chapter will also discuss circular motion.
Objects may move in a straight line, take a circular path, rotate, vibrate, or exhibit a combination of these motions.