Velocities can be positive or negative, because the sign of the velocity depends on whether the position is becoming more or less positive. Since the ultrasound pulses are only emitted toward the front, all positions will be positive. Any object in front of the detector has a positive position. When using the motion detector, the position of the detector is set as the origin by the software. Recall that position is measured with respect to an origin of coordinates, and that values of position can be positive, zero, or negative. time data and generate corresponding graphs of velocity and acceleration vs. Algorithms are used to take the position vs. Software measures the round-trip time of the sound pulses and plots a graph of the position of the object as a function of time. The sound reflects off of an object and returns to the detector. The motion detector works by emitting pulses of ultrasound (frequencies above the range of human hearing) at a regular rate, typically 20 per second. Scale is used for all graphs representing the same situation. Vertical axis may be POSITION, VELOCITY, or ACCELERATION. You'll produce motions, and the motion detector and software will generate graphs of position, velocity, and acceleration as a function of time. Sonic ranger) will be aimed at various objects. In this activity, an ultrasonic motion detector (also called a To investigate position, velocity, and acceleration as aįunction of time using graphical representations generated by a motion detector Details of what you submit are at the bottom of this page. Instead, you'll submit several pages of hand-drawn graphs with descriptions followed by a conclusion. Your report will not be a complete formal report. You'll do the prelab assignment on WebAssign and submit your final report as a scanned document. Investigating Motion with a Motion Detector The following activity is an introduction to the fundamentals of the graphical representation of motion.
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