phy201
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 rhythm of the sounds seem to get faster as time went on.
** Your description of the rhythm of the pendulum when tilted 'forward' **
The rhythm of the sound seems to become further apart as time went on.
** Your description of the process used to keep the rhythm steady and the results you observed: **
I did not have to use a shim to level the bracket. The rhythm remained very steady until the pearl was at rest. The pearl hit the bracket 10 times.
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
Two dominos were placed at the top left and right sides of my physics textbook. The bracket and pearl were placed at the center on the textbook with the side with the pearl facing the bottom of the book. The bracket was also parallel with the sides of the book. The pearl was pulled back and then released. The rhythm gradually slowed down.
The bracket was rotated 45 clockwise and the pearl was again released. The rhythm slowed down this time as well but not as much as the previous try.
The process was repeated at 45 degree rotations until the bracket was back at its orginal position.
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
The bracket seemed to have the most constant beat pattern when it rotated 45 degrees from the top of the book(that is the pearl was facing the top of the book).
** Your report of 8 time intervals between release and the second 'hit': **
.519
.453
.488
.515
.429
.402
.503
.492
The previous 8 numbers are the time it took from the release of the pearl until the second time it hit the bracket. Times are in seconds.
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
.457, .613, .660, .746
.503, .574, .602, .625
.499, .625, .636, .752
.562, .601, .660, .687
The above numbers are the times the pearl hit the bracket every other hit(2nd, 4th, 6th...). The times are in seconds. They were obtained by clicking the timer every other time the pearl hit the bracket.
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
10.2cm
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
.475, .098, .039
** Your description of the pendulum's motion from release to the 2d hit: **
1
** Your description of the pendulum's motion from the 2d hit to 4th hit: **
2
** 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: **
4
** 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; it is the same as the motion from the 4th hit to the 6th hit
** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
I think that the time interval should be longer because the pearl is starting from rest during the release to 2nd hit.
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
I think the time intervals should decrease
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
Because for the most part the time intervals remained fairly constant throughout the experiment at one constant length. The pearl was released at different points during the experiment yet the time intervals stayed fairly consistent.
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1hr
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