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Ever wondered why graphs are useful? AP Physics 1 and College Preparatory Physics students can tell you why! They spent a class period reading graphs of position and time and using them to predict exactly when, where, and how quickly their lab partner should walk to copy those graphs. Along the way they discovered that when the position-time graph is a straight line with no slope, their lab partner should stand completely still in front of their motion detector. When the position-time graph had a positive slope? Walk away from the motion detector! But what about a negative position-time slope? Walk toward the motion detector of course! And when they had to match a random curved graph? Not a problem. Just accelerate by changing your speed and direction. By the end of the lab, every lab group was producing graphs almost identical to the graphs they were given.