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:
I got a little confused on this assignment and I am not really sure that my data is correct since I got negative numbers at one point.
Your description of the rhythm of the pendulum when tilted 'back'
The sounds get closer together and the rhythm speeds up instead of staying constant.
Your description of the rhythm of the pendulum when tilted 'forward'
The rhythm got further apart and slowed down.
Your description of the process used to keep the rhythm steady and the results you observed:
To make the pendulum rhythm steady I had to try different surfaces until I found a flat one. This caused the rhythm to become steady. The pendulum hit the bracket 15 times.
Your description of what happened on the tilted surface, rotating the system 45 degrees at a time:
When the pendulum is placed on an elevated textbook, the sounds of the rhythm are different at different angles.
1. When the pendulum is parallel to the textbook, the rhythm is fast and the bounces become closer together.
2. When rotated 45 degrees counterclockwise, the rhythm speeds up.
3. When rotated another 45 degrees counterclockwise, the rhythm is still fast.
4. When rotated another 45 degrees counterclockwise, the rhythm is fast again.
5. When rotated another 45 degrees counterclockwise, the rhythm is still fast.
6. When rotated another 45 degrees counterclockwise, the rhythm slows down and the bounces become further apart.
7. When rotated another 45 degrees counterclockwise, the rhythm is still slow.
8. When rotated for the last 45 degrees counterclockwise, the rhythm is still slow.
Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm:
When the bracket is parallel then the rhythm of the beat is the most regular.
Your report of 8 time intervals between release and the second 'hit':
.391
.563
.391
.656
.547
.313
.328
.359
Your report of 4 trials timing alternate hits starting with the second 'hit':
.516, .406, .438, .344
.297, .406, .219, .453
.438, .422, .547, .406
.375, .781, .625, .547
The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous):
8.2 cm
Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging:
.11, -0.32, .094
-.109, .187, -.234
.016, -.125, .141
-.406, .156, .078
Your description of the pendulum's motion from release to the 2d hit:
The motion of the pendulum between release and the first 'hit' is slower than the other hits.
Your description of the pendulum's motion from the 2d hit to 4th hit:
The motion becomes faster between the first 'hit' and the second '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 release and the second 'hit' is slower than the motion between second 'hit' and fourth '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 motion between the second 'hit' and the fourth 'hit' is slower than the motion between the fourth 'hit' and the sixth 'hit'.
Your conjecture as to why a clear difference occurs in some intervals vs. others:
The force is greater during the first time interval.
What evidence is there that subsequent intervals increase, decrease or remain the same:
We would expect the time intervals to increase.
What evidence is there that the time between 'hits' is independent of the amplitude of the swing?
The swing depends on the position of the pendulum as well as the length of the pendulum.
Your data look good.
After the due date we will be discussing this experiment further via an online forum.