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'
In this experiment, the pendulum strikes the bracket more and more frequently. The sounds get closer together and the rhythm gets faster.
Your description of the rhythm of the pendulum when tilted 'forward'
When doing this, the pendulum slows and the sounds get further apart. The rhythm gets slower.
Your description of the process used to keep the rhythm steady and the results you observed:
The rhythm is more steady and constant when the bracket is on a level surface. Also, the rhythm sounds the same with each bounce. The pendulum hit the bracket an average of 16 times.
Your description of what happened on the tilted surface, rotating the system 45 degrees at a time:
When starting out, the sounds get further apart as do the sounds. The bracket was tilted forward and the pearl hung off the bracket. When rotated 45 degrees, the bracket is still tilted forward, but at a different angle on the book. This time the motion slows. When rotated another 45 degrees, you set at a 90 degree rotation (or sideways on the book) and the rhythm is more constant than before.
at 45 degrees - it slows
at 90 degrees - it is more constant
at 135 degrees - it is more frequent
at 180 degrees - it is more frequent
at 225 degrees - it is more frequent
at 270 degrees - it is more constant
at 315 degrees - it slows
at 360 degrees - it slows
Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm:
You should position the bracket at a 90 degree rotation or a 270 degree rotation.
Your report of 8 time intervals between release and the second 'hit':
1 236.9844 236.9844
2 237.2188 .234375
3 237.5625 .34375
4 237.8594 .296875
5 238.1563 .296875
6 238.4688 .3125
7 238.7969 .328125
8 239.0938 .296875
9 239.4219 .328125
10 239.7188 .296875
Your report of 4 trials timing alternate hits starting with the second 'hit':
.891, .6875, .719, .875
.781, .718, .797, .921
.625, .781, .859, .890, .797
.797, .891, .828, .922
The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous):
The pendulum is 8.5 cm in length.
Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging:
.77, .004, .031
Your description of the pendulum's motion from release to the 2d hit:
It hits against the bracket very rapidly. So rapidly in fact that it is hard (for me at least) to time it.
Your description of the pendulum's motion from the 2d hit to 4th hit:
Although it is still hitting at a fast pace, the motion is slower than the first hit.
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 between the second hit and the fourth hit is slower than the motion between release and the second hit.
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 fourth hit and the sixth hit are slower than the second and fourth hit.
Your conjecture as to why a clear difference occurs in some intervals vs. others:
The first time interval it traveling faster because it hasn't hit any resistence. Then when it hits the bracket, it experiences resistence and it slows each time.
What evidence is there that subsequent intervals increase, decrease or remain the same:
The time intervals should increase because the pendulum slows.
What evidence is there that the time between 'hits' is independent of the amplitude of the swing?
The longer the length the greater the time interval. The shorter the string, the quicker it hits.
Your report has been received. You appear to have good data and good answers to questions. We will be discussing this work as a group, after the due date.