phy 121
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. At first, it sounds like they are constant and at the end, they become faster and softer.
** Your description of the rhythm of the pendulum when tilted 'forward' **
The sound becomes further apart. The sound is loud and constant at the beginning and then gets softer and less frequent and stops.
** Your description of the process used to keep the rhythm steady and the results you observed: **
I had to prop the back of the bracket up with 3 quarters to make it level. Once I done this and released the pearl, the rhythm was steady and it hit around 12 times.
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
The sound seems constant. (starting position)
The sounds seem constant. (45 degrees counterclockwise)
The sound is closer together (90 degrees counterclockwise)
The sound is closer together (135 degrees counterclockwise)
The sound is getting closer together (180 facing back of book)
The sound is getting further (225 degrees counterclockwise)
The sound is getting closer to constant (270 degrees counterclockwise)
The sound is getting closer to constant (315 degrees counterclockwise)
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
The original position or at 45 degrees or 315 degrees has the most constant beats.
** Your report of 8 time intervals between release and the second 'hit': **
1 32.6875 32.6875
2 33.23438 .546875
3 33.57813 .34375
4 33.79688 .21875
5 34.04688 .25
6 34.3125 .265625
7 34.5625 .25
8 34.875 .3125
The numbers are fairly close to each other (after the 2nd hit) and shows that the pendulum is hitting at a constant speed.
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
.562, .5625, .734
The numbers show that the speed is not as fast but is still constant till the last one. I obtained this by taking the measurements of hits 2, 4, 6
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
6.5mm
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
.562, .5625, .734
** Your description of the pendulum's motion from release to the 2d hit: **
.5 interval
** Your description of the pendulum's motion from the 2d hit to 4th hit: **
1 interval
** 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: **
1.5 intervals on second hit, 2 intervals from 2nd hit to 4th. The difference is the starting point is already .5 interval less.
** 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: **
2 intervals from 2nd to 4th hit, there is no difference in the intervals.
** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
The starting point is at the extreme point where the other timed intervals is starting from the equilibrium point and adds ½ interval.
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
I believe they will stay the same if the bracket position is not moved, it appears to be constant.
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
If the same experiment is done at different lengths, the swing of the pendulum becomes lesser or further in between but the pendulum will still either be constant, less frequent or more frequent.
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1.25 hours
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&#Your work looks very good. Let me know if you have any questions. &#