#$&*
Phy 121
Your 'cq_1_00.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** CQ_1_00.1_labelMessages **
The problem:
You don't have to actually do so, but it should be clear that if you wished to do so, you could take several observations of positions and clock times. The main point here is to think about how you would use that information if you did go to the trouble of collecting it. However, most students do not answer these questions in terms of position and clock time information. Some students do not pause the video as instructed. To be sure you are thinking in terms of positions and clock times, please take a minute to do the following, which should not take you more than a couple of minutes:
•Pick one of the videos, and write down the position and clock time of one of the objects, as best you can determine them, in each of three different frames. The three frames should all depict the same 'roll' down the ramp, i.e. the same video clip, at three different clock times. They should not include information from two or more different video clips.
•For each of the three readings, simply write down the clock time as it appears on the computer screen, and the position of the object along the meter stick. You can choose either object (i.e., either the pendulum or the roll of tape), but use the same object for all three measurements. Do not go to a lot of trouble to estimate the position with great accuracy. Just make the best estimates you can in a couple of minutes.
Which object did you choose and what were the three positions and the three clock times?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I chose to measure the tape. The three positions along with their clock times are as follows: About 8 inches at 40.578 seconds, About 12 inches at 40.796 inches, and about 18 inches at 40.906 inches.
#$&*
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):
If one were given a list of a series of positions and clock times, one could determine how fast an object was moving and at what time it was going its fastest speed as well as its lowest speed. Considering that the instructor mentioned that the play by play on this video could be a bit laggy, I believe that one could still estimate the position and clock times to be roughly accurate. For example one might say that the tape reached the 8 inch mark on the ruler within .05 seconds of 40.578 seconds.
I determined this because I know for a fact that the tape did reach, and also pass the 8 inch mark, and that at the time that I paused the video when I saw that it was at 8 inches, the clock read 40.578. But due to lag that could be present when pausing the video it would be safe to say that it could be within .05 seconds off, becase it could not be too big of a number since the tape was moving at an extremely fast rate, hence why it was so hard to pause the video at a specific point without some higher use of effort.
I think I could fairly accurately determine the both the positions and clock times, after pausing and playing the video mulitple times.
#$&*
•How can you use observations of position and clock time to determine whether the tape rolling along an incline is speeding up or slowing down?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
By pausing the video at different spots in the video, one can determine when the tape is rolling at its highest rate and its lowest rate as well. Comparing the difference in the times of the positions of each paused scene can give us great insight on its path from the top of the incline all the way to the bottom.
#$&*
•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):
Similarly to the tape in the last problem, you can pause the video and focus what points on the tape the pendulum reaches at what time. This will show us just when it was going its fastest as well as its slowest.
#$&*
•Challenge (University Physics students should attempt answer Challenge questions; Principles of Physics and General College Physics may do so but it is optional for these students): It is obvious that a pendulum swinging back and forth speeds up at times, and slows down at times. How could you determine, by measuring positions and clock times, at what location a swinging pendulum starts slowing down?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
You can record the times and their corresponding positions in which the pendulum is swinging.
#$&*
•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):
You can compare the time of which the tape is shown passing a certain position on the tape and determine when and where the tape's speed is increasing, decreasing, and remaining constant.
#$&*
*#&!
`gr31
#$&*
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.
** CQ_1_00.1_labelMessages **
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):
I chose to measure the tape. The three positions along with their clock times are as follows: About 8 inches at 40.578 seconds, About 12 inches at 40.796 inches, and about 18 inches at 40.906 inches.
#$&*
In the following you don't have to actually do calculations with your actual data. Simply explain how you would use data of this nature if you had a series of several position vs. clock time observations:
•If you did use observations of positions and clock times from this video, how accurately do you think you could determine the positions, and how accurately do you think you would know the clock times? Give a reasonable numerical answer to this question (e.g., positions within 1 meter, within 2 centimeters, within 3 inches, etc; clock times within 3 seconds, or within .002 seconds, or within .4 seconds, etc.). You should include an explanations of the basis for your estimate: Why did you make the estimate you did?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
If one were given a list of a series of positions and clock times, one could determine how fast an object was moving and at what time it was going its fastest speed as well as its lowest speed. Considering that the instructor mentioned that the play by play on this video could be a bit laggy, I believe that one could still estimate the position and clock times to be roughly accurate. For example one might say that the tape reached the 8 inch mark on the ruler within .05 seconds of 40.578 seconds.
I determined this because I know for a fact that the tape did reach, and also pass the 8 inch mark, and that at the time that I paused the video when I saw that it was at 8 inches, the clock read 40.578. But due to lag that could be present when pausing the video it would be safe to say that it could be within .05 seconds off, becase it could not be too big of a number since the tape was moving at an extremely fast rate, hence why it was so hard to pause the video at a specific point without some higher use of effort.
I think I could fairly accurately determine the both the positions and clock times, after pausing and playing the video mulitple times.
#$&*
•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):
By pausing the video at different spots in the video, one can determine when the tape is rolling at its highest rate and its lowest rate as well. Comparing the difference in the times of the positions of each paused scene can give us great insight on its path from the top of the incline all the way to the bottom.
#$&*
•How can you use observations of position and clock time to determine whether the swinging pendulum is speeding up or slowing down?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
Similarly to the tape in the last problem, you can pause the video and focus what points on the tape the pendulum reaches at what time. This will show us just when it was going its fastest as well as its slowest.
#$&*
•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):
You can record the times and their corresponding positions in which the pendulum is swinging.
#$&*
•Challenge (University Physics students should attempt answer Challenge questions; Principles of Physics and General College Physics may do so but it is optional for these students): How could you use your observations to determine whether the rate at which the tape is speeding up is constant, increasing or decreasing?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
You can compare the time of which the tape is shown passing a certain position on the tape and determine when and where the tape's speed is increasing, decreasing, and remaining constant.
#$&*
*#&!
&#Good responses. Let me know if you have questions. &#