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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All this information was compiled using the larger video 4.
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 **************: I would estimate that it would be very difficult to give a reasonable answer within more than 2inches of distance. This is due to a combination of a blocked line of vision and camera distortion. At any given time, two inches of area are covered on the tape measure due to the pendulum and tape. Once the tape takes an obvious lead, there is roughly 4 inches of area covered due to the tape covering its area and the pendulum doing the same. The camera also distorts accuracy since it can not take enough frames per second of the motion to not cause a blur behind the item which would cover the more precise markings between each inch on the tape measure. Time wise, there are different levels of accuracy depending on where one pauses. On my first pausing, I had almost two sets of times overlapping one another through the thousandths place on the clock. This makes exact measurement impossible and leaves just an average of the two times at best. On another instance when I paused, I had an EXACT 21 seconds. This is obviously a fluke but allows for precise time measurement. On average, I would estimate all times could be rounded to the tenth and be just as accurate as trying to read the clock.
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 **************: The best way to observe if the tape is changing speed would be to take a broad distance (maybe 6 inches) and clock how long it takes to travel that far. Then, do this again a foot later and see if there is a measurable difference. The problem with this is if the clock appears at an unrecognizable time and we round, then the numbers may appear closer or further away than they should be and skew the observation’s data.
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 **************: There are two ways to figure out if the pendulum is speeding up, one relative and one with data. If the pendulum is keeping up with the tape to begin with, then the tape easily passes the pendulum, then we can state that either the tape is speeding up(which we may know from the previous question) or the pendulum is slowing down. With that in mind, for more precision, we could measure the first quarter of a cycle of the pendulum then measure the second quarter and compare times.
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~30minutes
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&#Your work looks good. See my notes. Let me know if you have any questions. &#