2011 Summer 102M Postlab 3

# 2011 Summer 102M Postlab 3 - lab? List at least 3 make sure...

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Thu Hoang PHY 102M MW 10-12 Lab 3 1. Why do we find three points and take a beginning acceleration and an end acceleration for each graph? Did we get a better answer than just using the first and last point and just one acceleration? We used three points to take a more precise average of acceleration from the start of the drop to the end of each run. I believe we got a better answer using three points rather than just the first and last point. 2. If you include a heavier string, the mass of that string would change our graphs. How would they change the graph? Briefly explain your answer. Hint: Think about how the string’s mass affects at the beginning… Think of how it affects at the end. With a heavier string, at the beginning the acceleration would be slower and as the weights drop the acceleration will increase. There will be a steep slope compared to the graphs without the heavier string. 3. Other than the mass of the string, what other sources of error did we encounter in this
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Unformatted text preview: lab? List at least 3 make sure you include a systematic error source and a random error source. Label each as random or systematic. Other systematic errors that can happen in this lab are air resistance, and pulley friction, pulley mass. Random errors could result from the measurement process like the small differences in the reaction time of starting and stopping. 4. Wiki question: Explain why a traction elevator uses a counterweight and discuss how they set the mass of the counterweight. Bonus for mention of why they use slightly less than 50% for the counterweight. They use a counterweight to offset the weight of the car and passengers for balance and to ensure that the elevator cannot fall out of control when the cable is intact. It also reduces the power needed to move the car. Counterweights equal the weight of the elevator plus about 40-50% of its max rated load....
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## This note was uploaded on 06/28/2011 for the course PHY 102M taught by Professor Staff during the Summer '08 term at University of Texas at Austin.

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