Phy231
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' **
Closer together.
** Your description of the rhythm of the pendulum when tilted 'forward' **
Still closer together but not as quickly.
** Your description of the process used to keep the rhythm steady and the results you observed: **
Tilted the bracket forward so that the pearl just touched the bracket.
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
0 closer
45 further
90 further
135 further
180 closer
215 closer
270 closer
315 closer
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
At 90 degrees clockwise.
** Your report of 8 time intervals between release and the second 'hit': **
0.422
0.445
0.453
0.421
0.445
0.367
0.320
0.422
Time for bob of pendulum to strike twice the bracket it hangs from when elevated to 45 degrees and released.
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
0.570,0.742,0.570,0.727,0.664
0.508,0.648,0.648,0.688
0.594,0.547,0.516,0.632
0.492,0.523,0.539,0.656
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
9.95cm
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
0.541,0.615,0.608
** Your description of the pendulum's motion from release to the 2d hit: **
1
** Your description of the pendulum's motion from the 2d hit to 4th hit: **
2. The second hit requires the pendulum to swing from equilibrium to extreme point and then back to equilibrium.
** 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: **
3. The second hit and fourth hit have 4 intervals between them since the pearl must swing from equilibrium to extreme point and back for the 2 and 3 hits where the 1st hit only travels from extreme point to equilibrium.
** 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: **
4. It doesn't differ.
** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
Since it only performs 1/4 cycle where the other hits perform 1/2 cycle.
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
Stay the same until the pendulum loses too much energy due to striking the bracket.
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
It shows that even with a release from a higher position, a pendulum will settle into a steady rhythm for a few strikes (swings) until it loses too much energy and comes to rest. Therefore the pendulum's swing does not depend on how far it swings.
** **
2 hours
** **
&#This looks very good. Let me know if you have any questions. &#