Phy 201
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: Roll of tape. THREE POSITIONS AT 3 CLOCK TIMES ARE-11CM AT 59.687
20cm at 60.234
1cm at 59.140
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: Positions within 1cm ,clock time between .07 sec.I got this numerical value from my data .Time variation between 10cm was .7sec ,so for 1cm ,it would be .07 sec.
• 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?
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answer/question/discussion: I think it was slowing down. From my data above , it too less time to reach to 11cm from 1 cm but more from 11cm to 20 cm.
• How can you use observations of position and clock time to determine whether the swinging pendulum is speeding up or slowing down?
I could not answer this.
You didn't actually have the observations, but you could easily make observations similar to those you did have to answer this question, using the same strategy you used in the preceding question. You aren't expected here to actually make these observations, just to say how you would use them if you did.
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20 minutes
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&#Your work looks good. See my notes. Let me know if you have any questions. &#