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Physics Lab write up 2

# The computer setup of part iii is to connect the

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The computer setup of part III is to connect the photogate’s stereo phone plug to Digital Channel on the interface. Open P06_FALL document in the physics lab folder on the desktop. The graph in the document will display plots of position and velocity versus time and a table of position, velocity, and acceleration versus time. Next in order to setup the equipment turn the photogate head sideways so when you drop the “picket fence” vertically from above you can have the “picket fence” move through the photogate’s opening without hitting the photogate. After the partners decide while trial is the best then they can compare data by drawing a box around the desired area of your graph versus original graph and adding in a linear fit to see what the slope (acceleration), speed, and velocity is of the object. To find the percent discrepancy we use the formula|*100%. Our percent discrepancy between the slope of the our velocity versus time plot (9.73) and the accepted value of the acceleration of a free falling object (g=9.8) was 0.70% while the percent discrepancy between the mean of the acceleration from the table (9.7) and the accepted value of the acceleration of a free falling object (g=9.8) was 1.00%. Unfamiliar Terms : Photogate : A device that measures the time between events that interrupt an infra- red beam. (http://en.wiktionary.org/wiki/photogate). Percent discrepancy: =|*100% (from lab).

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Percent error : =(from lab). Motion sensor : uses the pulses of ultrasound that reflect from an object to determine the position of an object. (From lab). Picket fence : A clear plastic strip with uniformly spaced opaque bands (from lab). Velocity : The time rate of change of position of a body in a specific direction. (dictionary.com) Acceleration : The time rate of change of velocity with respect to magnitude or direction; the derivative of velocity with respect to time. (dictionary.com) Speed : rate of motion or progress. (dictionary.com) Graph : a mathematical picture of the motion of an object. (from lab) Data: Part I. How close should you be to the motion sensor at the beginning? 0.40m How far away should you move? 0.70m How long should your motion last? 4s How fast should you move while you are walking? .175 Analysis: Percent error : = Sample: Percent discrepancy : =|*100% Sample: |1.00% Results and Conclusion: This lab parts I and II was executed to teach students about the relationships between the motion of an object (the student) and a graph of velocity and time for the moving object while Part III of the lab was executed to teach students how to measure the acceleration of an object in freefall. The end result for part I was that one of us stood still from 0-2 seconds at .40m. Then moved backwards with constant velocity for four seconds. Then stayed there for four seconds at 1.10 meters to finish off with a
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The computer setup of part III is to connect the photogates...

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