Phy201
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 depict the same 'roll' down the ramp, at three different clock times. 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 (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?
I chose the first video and I found that the ball started at 58.8s in and reach the twelve inch mark at 59.6s followed by reaching the 22inch mark oor the finish at 60s.The speed incease would be explained by the constant acceleration of the ball.
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.)..
I believe that I could give the measurements to 1 inch and the time to the .002s. With the use of the replay button I feel as thugh I could get it close than with the human eye alone.
• 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?
The decrease in the amount of time that it takes to cover a certain amount of distance. Also giving the effects of gravity it wouldn’t be to hard to prove.
• How can you use observations of position and clock time to determine whether the swinging pendulum is speeding up or slowing down?
The swinging pendulum accelerates until it reaches the middle of the ruler and then it appears to start to slow down as it oposes gravity.
• 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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20min
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sorry sent last one without my information
gr33