Phy 201
Your 'pearl pendulum' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** Your general comment, if any: **
** Your description of the rhythm of the pendulum when tilted 'back' **
the sounds get closer together the rhythm get faster. i heard the pearl striking the metal as it was going the distance away from the metal was shorter so it hit faster.
** Your description of the rhythm of the pendulum when tilted 'forward' **
the rhythm remains steady. it remains constant. i tried it several times and if you count 123 123 123 then it was steady.
** Your description of the process used to keep the rhythm steady and the results you observed: **
I used a ruler to place under the bracket to tilt it forward just a bit and after a few adjustments got the rhythm steady. the pendulum hit the bracket 18 times. and it was completely steady by my ears anyway.
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
parallel to one side of the book the sounds get closer together.
45 degrees from the starting point the sounds are still closer together.
90 degrees from the start and the sounds are still closer together.
135 degrees from the start and the sounds are still closer together.
then back to the original position each step sounded the same.
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
i made sure the bracket remained in the center of the book but all of the sounds were the same i would have thought with the bead barely touching the metal it would have became more steady of a rhythm then when the bead was completely against the metal but that was not the case in my results.
** Your report of 8 time intervals between release and the second 'hit': **
.344
.402
.395
.398
.410
.414
.359
.359
my numbers represent the time from point of release of the pendulum to the second hit against the metal. I used the timer program to get these numbers and i did two trials for each of my four positions.
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
.391, .641, .758, .594, .488, .582, .512
.367, .566, .652, .589, .535, .520, .617
.352, .496, .648, .535, .672
.406, .527, .578, .520, .414
my results are the times between each second time the bead hits the metal i did one trial for each of the four positions.
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
10.2 cm
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
.379, .179, .48
** Your description of the pendulum's motion from release to the 2d hit: **
1 interval
** Your description of the pendulum's motion from the 2d hit to 4th hit: **
2 intervals after the initial hit the distance is shorter so the bead hits faster each time. the first hit is only one interval because it goes from the extreme to equilibrium and thats is. the difference between the first hit and the second hit it goes from equilibrium to the extreme and back to equilibrium so 2 intervals.
** Your description of the difference in the pendulum's motion from release to the 2d 'hit', compared to the motion from the 2d 'hit' to the 4th hit: **
3 intervals because it goes from the extreme to equilibrium back to the extreme and then again to equilibrium so three intervals are involved. the second hit to the fourth hit would have 4 intervals between them.
** Your description of the difference in the pendulum's motion from the 2d to the 4th 'hit' compared to the motion from the 4th to 6th hit: **
4 intervals between the second hit and the fourth hit it would be the same as the fourth hit to the sixth hit except they hit faster each time. goes from the equilibrium the extreme to equilibrium to exterme back to equilibrium.
** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
i did not expect this. we could expect this if the bead had to go from one extreme to the opposite extreme. because its first you would expect it to take less time
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
i expect that subsequent time intervals would decrease
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
this experiment does not support the idea that the length of a pendulum's swing depends only on ity lenght, and is independent of how far it actually swings. it does depend on how far it swings which is related to its length but to obtain accurate measurements the direction in which it swings or the difference in elevation can also affect the way it swings. the distance you release the pendulum from changes the information you gather.
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1.5 hours
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You're doing well here--good data and good explanations. No need for a revision, but do see the link below, and be sure you understand that if the system is set up with a steady rhythm, then independence of time of swing and amplitude is confirmed.
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