Phy 201
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' **
The Rhythm seems get faster. Initially there were slow ticks but then more rapid ones.
** Your description of the rhythm of the pendulum when tilted 'forward' **
The sounds get further apart meaning that the rhythm is getting slower. Initially there were faster ticks, followed slower ticks, followed by none.
** Your description of the process used to keep the rhythm steady and the results you observed: **
I set my pendulum on a hard cover book, I also tilted it back a bit because my pendulum seems to like to lean forward. When i released my pearl, the rhythm was very steady and hit the pendulum 12 times before stopping.
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
I placed one domino under the top right of my notebook and the top left. My first test had the pendulum leaning back a bit due to the incline of my book. The pendulum was parallel to the right side of my book and the clicking sped up. My second trial had the pendulum parallel to the top of my book and the clicking was constant. My third trial had the pendulum parallel to the left side of the book and the pendulum was tilting forward. This caused the clicking to slow down. The final trial had the pendulum parallel to the bottom of my book and was almost level. This was more constant.
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
I would orient my bracket to be level and parallel to the bottom of my notebook.
** Your report of 8 time intervals between release and the second 'hit': **
.336
.289
.313
.344
.375
.352
.344
.351
These numbers are the time intervals for two strikes of the pendulum. They were obtained using the timer program.
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
.484375, .515625, .625, .5703125
.3515625, .5078125, .625, .5859375
.4453125, .4765625, .5703125, .5781
.4296875, .46093, .57031, .5390625
.3125, .5390625, .46875, .484375
.5, .4609375, .5546875
.6796875, .484375, .5
.4765625, .53125, .546875, .4375
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
7.50cm
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
.45, .49, .56
** Your description of the pendulum's motion from release to the 2d hit: **
3
** Your description of the pendulum's motion from the 2d hit to 4th hit: **
4
** 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: **
7 between release and second hit and 8 between 2nd and 4th 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: **
8, There would also be 8 between fourth and 6th.
** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
Because there are fewer movements from extreme point to equilibrium. It only has to move 3 times as opposed to 4.
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
stay the same
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
There was variation is how far I lifted it but the time intervals stayed fairly constant.
** **
1 hour
** **
I found it really difficult to be accurate about pendulum hits. I am pretty sure it showed in my data, but i recognize why my data must be incorrect.
Your data appear to be fine, as is your work on this experiment.