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 sounds get closer and faster as the pendulum is tilted.
Your description of the rhythm of the pendulum when tilted 'forward'
The pendulum sounds are slower and further apart.
Your description of the process used to keep the rhythm steady and the results you observed:
I placed the pendulum on a desk. The pearl hit the bracket about 5 times on each try. The rhythm was about the same.
Your description of what happened on the tilted surface, rotating the system 45 degrees at a time:
I placed the bracket so that the pearl was on the binding side of my text book. The pearl hit the bracket about 3 times. I then turned the bracket 45 degress counterclockwise. The pearl slowed down a little but the strikes were about the same. I turned the bracket 45 degrees. The rhythm got slower and the strikes decreased by one. I turned the bracket 45 degrees. The rhythm increased a little and the strikes incresed by one. I rotated the bracket 45 degrees. The rhythm got faster and the strikes increased by one. I rotated the bracket 45 degrees. The rhythm increased but the strikes remained the same at 6. I rotated the bracket 45 degrees. The bracket is now facing the top of my book. The rhythm increased and the strikes increased up to 8. I turned the bracket 45 degrees and the rhythm decreased and the number of strikes decreased by one.
Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm:
I would position the bracket so that it is facing either the top or bottom of the book. You don't have to deal with the angles when the bracket is facing the binding side of the book.
Your report of 8 time intervals between release and the second 'hit':
1 220.3281 220.3281
2 220.7188 .390625
3 233.6094 12.89063
4 233.9844 .375
5 240.7969 6.8125
6 241.2344 .4375
7 246.6563 5.421875
8 246.9688 .3125
9 251.4063 4.4375
10 251.8125 .40625
11 260.1406 8.328125
12 260.5938 .453125
13 302.8438 42.25
14 303.2344 .390625
15 308.5938 5.359375
16 308.9531 .359375
Your report of 4 trials timing alternate hits starting with the second 'hit':
.484375, .265625, .328125, .375, .265625, .328125, .296875, .34375, .359375, .40625, .40625
The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous):
Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging:
.484 elapses between the release and the second hit
.593 elapses between the second and fourth hit
.64 elapses between the fourth hit and the sixth hit
Your description of the pendulum's motion from release to the 2d hit:
The string of the pendulum is extended out. When it is released it hits the bracket. The string has to keep straight for the best results.
Your description of the pendulum's motion from the 2d hit to 4th hit:
The first hit has a dead on hit. After the first hit, the pendulum will go from side to side. The side to side motion will determine how much time it takes to get back to the bracket.
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 side to side motion can get greater and also the force of the pendulum will decrease.
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 is now slowing down and coming to a stop.
Your conjecture as to why a clear difference occurs in some intervals vs. others:
The pendulum is coming down with the most force.
What evidence is there that subsequent intervals increase, decrease or remain the same:
The intervals would decreas because the force is decreasing.
What evidence is there that the time between 'hits' is independent of the amplitude of the swing?
The length of the swing is one factor but also how far it swings is important too. If the swing is short then the pendulum will only swing for a few strikes. The greater the distance of the of the swing, the pendulum will strike the bracket more.
Your data look good.
After the due date we will be discussing this experiment further via an online forum.