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' **
By tilting the bracket back it causes the sounds to get closer and closer. The rhythm gets slower.
** Your description of the rhythm of the pendulum when tilted 'forward' **
The sounds get closer and closer.
** Your description of the process used to keep the rhythm steady and the results you observed: **
I tilted the bracket forward just a little bit so the ball was barely touching the bracket. The pendulum hit the bracket six times.
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
Book lying normal, top of book pointing to 12 o'clock.
With pendulum starting at 0 degrees, result 4 hits.
45 degrees, result 3 hits.
90 degrees, result 4 hits.
135 degrees, result 3 hits.
180 degrees, result 4 hits.
225 degrees, result 4 hits.
270 degrees, result 5 hits.
315 degrees, result 4 hits.
360 degrees, result 4 hits.
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
I would place the bracket on the book in the 315 degree position.
** Your report of 8 time intervals between release and the second 'hit': **
155.434 155.953 .519
161.441 161.953 .512
168.809 169.328 .519
175.266 175.754 .488
179.504 179.992 .488
183.617 184.047 .430
187.266 187.785 .519
191.992 192.481 .489
First column is start time, second column is time of second click, third column is difference between the two.
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
.559, .648
.594, .625
.602, .582
.559, .594
.527, .648
.656, .578
.547, .589
.648, .609
The first column is the amount of time from the initial click to the click of the second hit, the 2nd column is the amount of time in between the 2nd hit and the 4th hit. They were obtained by starting a timer at the release of the pendulum, and marking times at every 2 hits.
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
9.6 cm
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
.589, .609
** Your description of the pendulum's motion from release to the 2d hit: **
The pendulum is restricted to being released from an extreme point to its equilibrium, at which point it strikes an object.
** Your description of the pendulum's motion from the 2d hit to 4th hit: **
The pendulum reflects off the object to an extreme point and back to the object where it strikes again at its equilibrium.
** 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: **
It starts at an extreme point and swings to its equilibrium. In the latter, it starts at its equilibrium swings to its extreme point and back to its equilibrium.
** 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: **
the only difference would be loss of momentum, resulting in smaller swings.
** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
The first time interval is a shorter distance.
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
increase
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
** **
54 minutes
** **
&#Your work looks very good. Let me know if you have any questions. &#