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 rhythm appears to remain constant as pearl strikes the bracket.
Your description of the rhythm of the pendulum when tilted 'forward'
With the bracket tilted forward the rhythm of the pearl striking the bracket slow down with each strike until it stops striking the bracket while swinging and then the pendulum finally stops.
Your description of the process used to keep the rhythm steady and the results you observed:
I started with the bracket level. I then tilted the bracket backwards and ran a trial. Then I tilted the bracket forward and ran another trial. I found that with the bracket level seem to have the steadiest rhythm.
Your description of what happened on the tilted surface, rotating the system 45 degrees at a time:
Place 2 dominoes under the left and right hand corners on the spline side of the book. I placed the bracket in the middle of the book with the pendulum opposite of the spline. The pendulum struck the bracket continued swinging without hitting the bracket and stopped. I rotated the pendulum counter clockwise 45 degrees. The pendulum continually struck bracket with the rhythm speeding up before stopping. It continuously rotated bracket 45 degrees counter clockwise while running trials at each rotation. The experiment ends when you reach the initial starting position.
Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm:
For the most regular rhythm the bracket and pendulum should be oriented so that it is parallel to the spline of the book.
Your report of 8 time intervals between release and the second 'hit':
.531
.469
.484
.469
.531
.469
.469
.469
Your report of 4 trials timing alternate hits starting with the second 'hit':
.594,.781,.750,.672
.516,.797,.828,.781
.547,.688,.844,.750
.594,.641,.609,.719,.875
The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous):
The length of the pendulum is 7.56cm from the bottom of fixed pearl to the center of the swinging pearl.
Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging:
.56,.73,.76
Your description of the pendulum's motion from release to the 2d hit:
The motion of the pendulum between the initial release and first strike has the longest actual swing.
Your description of the pendulum's motion from the 2d hit to 4th hit:
The motion of the pendulum between the first hit and the second hit has a shorter swing than the initial release and 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 pendulum still decreases and actual swing between hits.The first time interval will be shorter because the pendulum has more velocity because of the higher starting position
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 actual pendulum swing decreases with each swing.
Your conjecture as to why a clear difference occurs in some intervals vs. others:
The first time interval will be shorter because the pendulum has more velocity because of the higher starting position
What evidence is there that subsequent intervals increase, decrease or remain the same:
The time intervals would increase
What evidence is there that the time between 'hits' is independent of the amplitude of the swing?
The length of the pendulum is dependent only on its length. The pendulum will only swing its total length on its initial swing and each subsequential swing will have a shorter swing because of velocity.
Good work. See my notes. We will discuss these results next week.