PHY 121
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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cq_1_001
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:
Write down the position and clock time of one of the objects, as best you can determine them, in each of three different frames. This means that for each of the three readings, you just 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, 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?
In video 1, the tape started out slower than the pendulum and then about ½ way down, the tapes speed increased and reached the end before the pendulum. The clock on the end of the tape said 62.421.
&&&&I reviewed the tapes and on the 1st video I recorded the clock time of 61.875. The tape had reached then end and the pendulum is back at the beginning of the tape measure. The 2nd video I clocked a time of 44.515 and both then tape and pendulum had reached the end but the pendulum was just starting back up incline. The 3rd video is hard to see and the only time I could see to record was 33.6 and was swinging back down for the 2nd time.
You were to report three positions and three clock times.
What were the three positions and the three clock times you observed?
answer/question/discussion:
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 such observations:
If you did take observations of positions and clock times, how accurately do you think you could determine the positions, and how accurately do you think you would know the clock times?
I think it could be determined very acuratly by using pause at different places and seeing the clock each time the video is paused.
&&&&I would take the distance and divide it by the elasped clock time to calculate the velocity.
the question here is how you would use the positions and clock times you reported
answer/question/discussion:
How can you use observations to determine whether the tape rolling along an incline is speeding up or slowing down?
I used the pause button at different places to see if the tape was in front of or behind the pendulum.
Since you have measured the motion of the pendulum, comparison between the motion of the tape and that of the pendulum doesn't tell you whether the tape is speeding up.
answer/question/discussion:
How can you use your observations to determine whether the swinging pendulum is speeding up or slowing down?
Again, I used the pause button to see the place of the pendulum in regards to the tape.
answer/question/discussion:
&&&&I would use the clock time and position of each object to see which was moving faster. The clock time and position that is recorded should indicate the speed of the pendulum.
If you observe the motion of the tape relative to the pendulum, then you cannot use the motion of the pendulum relative to the tape to observe the motion of the pendulum.
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:
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:
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10 minutes.
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&#Please see my notes and submit a copy of this document with revisions and/or questions, and mark your insertions with &&&&. &#
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20 minutes
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I am resubmitting this with my revisions as requested. Please let me know what I am doing wrong. Thanks...
Your revisions look good.