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Phy 232
Your 'cq_1_00.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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The Problem:
You don't have to actually do so, but it should be clear that if you wished to do so, you could take several observations of positions and clock times. The main point here is to think about how you would use that information if you did go to the trouble of collecting it. However, most students do not answer these questions in terms of position and clock time information. Some students do not pause the video as instructed. To be sure you are thinking in terms of positions and clock times, please take a minute to do the following, which should not take you more than a couple of minutes:
Pick one of the videos, and write down the position and clock time of one of the objects, as best you can determine them, in each of three different frames. The three frames should all depict the same 'roll' down the ramp, i.e. the same video clip, at three different clock times. They should not include information from two or more different video clips.
For each of the three readings, simply write down the clock time as it appears on the computer screen, and the position of the object along the meter stick. You can choose either object (i.e., either the pendulum or the roll of tape), but use the same object for all three measurements. Do not go to a lot of trouble to estimate the position with great accuracy. Just make the best estimates you can in a couple of minutes.
Which object did you choose and what were the three positions and the three clock times?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
The object I choose was the whit roll of tape. The first time I recorded was 59.468s when the tape was measured to be approximately four inches down the ramp. The second observation was at 59.687s amd the tape was at twelve inches or a foot. Lastly, the third time recorded was 59.906s, when the tape as at 15.5 inches down the ramp.
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In the following you don't have to actually do calculations with your actual data. Simply explain how you would use data of this nature if you had a series of several position vs. clock time observations:
If you did use observations of positions and clock times from this video, how accurately do you think you could determine the positions, and how accurately do you think you would know the clock times? Give a reasonable numerical answer to this question (e.g., positions within 1 meter, within 2 centimeters, within 3 inches, etc; clock times within 3 seconds, or within .002 seconds, or within .4 seconds, etc.). You should include an explanations of the basis for your estimate: Why did you make the estimate you did?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
Considering the quality of the video, I believe it would be difficult to judge the postions to a number more accurate than to the half inch. With the clock shown, I do not see why you could not measure the time to the thousandths place or for example .001s.
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How can you use observations of position and clock time to determine whether the tape rolling along an incline is speeding up or slowing down?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
After plotting down positions and times for the tape, you easily could see if the object was speeding up or slowing down. This can be done by seeing how far the object travels in a certain amount of time and comparing that near points at the top with that of locations near the bottom. If the object covers more ground near the bottom, you know the tape is speeding up. If it covers less ground in the same amount of time, you know the tape is slowing down.
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How can you use observations of position and clock time to determine whether the swinging pendulum is speeding up or slowing down?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
You can do the same thing that you did for the tape. The same procedure and concepts apply for both objects.
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Challenge (University Physics students should attempt answer Challenge questions; Principles of Physics and General College Physics may do so but it is optional for these students): It is obvious that a pendulum swinging back and forth speeds up at times, and slows down at times. How could you determine, by measuring positions and clock times, at what location a swinging pendulum starts slowing down?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
Similar as before, one would need to plot points and times and calculate the distance covered in an amount of time and compare. Just to analytically think about it, I believe the pendulum would start to slow down immediately after reaching the equilibrium point. Even though the effects will not be vast or extremely noticeable, I believe the effects start to occur at this point.
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Challenge (University Physics students should attempt answer Challenge questions; Principles of Physics and General College Physics may do so but it is optional for these students): How could you use your observations to determine whether the rate at which the tape is speeding up is constant, increasing or decreasing?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I understand the question, but I am not completely sure how to answer it. However, I would assume the rate is constant because the slope is assumed to be the same throughout the ramp and the gravity has the same affect on the object throughout the run.
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The question is how you would use the data to either confirm or refute what you expect.
What calculations could you do with your data to test your hypothesis that the acceleration is constant?
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Check my note on that last question and please respond either with an answer or a good question related to the data.
&#Please see my notes and submit a copy of this document with revisions, comments and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end).
Be sure to include the entire document, including my notes. &#
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