Your work on pearl pendulum 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 sound gets closer together. In musical terms it would be like counting 1,2-&,3-e-&-a,and stopping on 4
Your description of the rhythm of the pendulum when tilted 'forward'
I sounded like it stayed steady. The rythym sounded steady but it just didn't hit the bracket as many times.
Your description of the process used to keep the rhythm steady and the results you observed:
I tilted the bracket forward a little bit and the rhythm was very steady and it hit the bracket 9 times.
Your description of what happened on the tilted surface, rotating the system 45 degrees at a time:
When the bracket was aligned with a the side of the book and the part with the pearl attached was facing the top the sounds sped up as the pearl came to rest up against the bracket.
The same thing happened when I turned the bracket so it alligned with the top-left-hand corner of the book.
When the bracket is parallel with the top of the book with the pearls facing the binding of the book the sounds didn't speed up or slow down.
The same thing happened when the bracket was aligned with the lower-right hand side of the book.
When the bracket if parallel to the binding of the book and facing the bottom of the book the sound doesn't slow down but the pearl doesn't hit the bracket as many time as before.
All the rest of the experiment went just as it had for the other side...all results where the same as the rigt hand side.
Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm:
I would orient it either facing the binding or right of left hand side of the book.
Your report of 8 time intervals between release and the second 'hit':
.516
.594
.594
.568
.594
.641
.609
.546
Your report of 4 trials timing alternate hits starting with the second 'hit':
.734, .766, .609, .828
.672, .656, .734, .828,
.640, .734, .798, .906
.671, .797, .688, .758
The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous):
8.5 cm
Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging:
.734, .722, .769, .728
Your description of the pendulum's motion from release to the 2d hit:
The pendulum swung down from the release point and struck the bracket.
Your description of the pendulum's motion from the 2d hit to 4th hit:
The pendulum bounced off the bracket and swung back into the air but not as high as the release point, then swung back down to strike the bracket again.
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 pendulum bounced off the bracket and swung back into the air but not as high as it did between the first and second hit, then swung back down to strike the bracket again.
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 pendulum bounced off the bracket and swung back into the air but not as high as it did between the second and third hit, then swung back down to strike the bracket again.
Your conjecture as to why a clear difference occurs in some intervals vs. others:
Because the pendulum lost momentem each time it struck the bracket.
What evidence is there that subsequent intervals increase, decrease or remain the same:
I would expect them to decrease until the pendulum finally came to rest.
What evidence is there that the time between 'hits' is independent of the amplitude of the swing?
It proves that this is incorrect because the swing of the pendulum would always decrease between hits because of the loss of momentum.
Good work. See my notes. We will discuss these results next week.