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.
** Your description of the rhythm of the pendulum when tilted 'forward' **
The sounds get further apart when tilted forward
** Your description of the process used to keep the rhythm steady and the results you observed: **
I used a piece of thick paper to adjust the level of the bracket so that the pendulum was barely touching the bracket.
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
Place dominoes under top left and right of book. Pendulum set up so that the ball is facing the bottom of the book, and the bracket is parallel to the sides of the book.
Released the pendulum and the sound got further apart. Rotated the bracket 45 degrees clockwise and the sound got closer together than the previous setup, but the sounds were still getting further apart. Turned another 45 degrees. The sound cycle was constant. Rotate 45 deg again and the soiunds gotr closer together.. Rotate again so that the ball if facuing the top of the book and the sounds were getting closer together more rapidly.
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
I would orient the bracket so the the ball is facing the side of the book.
** Your report of 8 time intervals between release and the second 'hit': **
0.297
0.297
0.297
0.313
0.344
0.313
0.297
0.313
These numbers are the time iontervals between clicks of the ball striking the bracket. I used the timmer program and practiced hitting the timer everytime the ball hit.
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
0.297,0.297,0.297,0.313,0.344,0.313,0.297,0.313
0.359,0.297,0.375,0.297,0.313,0.313,0.328,0.281,0.328,0.328,0.313,0.297,0.297,0.359,0.281,0.359,0.344
These number are the comparison fora short time interval and a fully run penulum drop until the ball stopped.
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
99 mm
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
.59,.61,.66
** Your description of the pendulum's motion from release to the 2d hit: **
The motion from relaese is the ball traveling to the equilibrium point
** Your description of the pendulum's motion from the 2d hit to 4th hit: **
This motion is the traveling to the extreme point back to the equilibrium point.
** 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: **
The motion is differece is the strating point. The motion from first release is the ball movin to eqilibrium point. Fromthe second hit the ball is moving to extreme point.
** 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: **
These are the same, other than the energy loss from striking the bracket.
** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
Because you are missing a portion of the full cycle travel path.
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
The intervals should stay relatively the same.
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
Each time the ball struck the bracket it lost energy and the ball return to a shorter swing location. But the rythem of the strikes remained the same.
** **
1 hour
** **
Very good.