phy201
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 soound seem to get relativly closer together and softer in pitch.
** Your description of the rhythm of the pendulum when tilted 'forward' **
the rythme seem to get a lilttle bit faster.
** Your description of the process used to keep the rhythm steady and the results you observed: **
I tilted it forward til the pendulum continued to swing bac and forth. the pendulum hit the backet about seven times or so before i sat it back upright.
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
I tried the pendulum at differenet angles to see which would get a better result i found theat tilting it backward tended to slow it down. i also found that leaning it forward speed it up and it last longer.
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
Slighly forward about 45 degrees
** Your report of 8 time intervals between release and the second 'hit': **
2 15.367 1.927979
3 16.85901 1.492004
4 18.79797 1.938965
5 20.362 1.564026
6 21.84302 1.481018
7 23.42401 1.580994
8 24.70801 1.283997
9 26.48798 1.779968
The numbers are 2 represent when the ball makes contact with the metal but it is hard to determin because i am not confortable with the program .
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
1.02002,1.361023,.9349976,1.047974
1.006042,.9439697, 1.184998
They mean that i am a little bit inaccurate in my timing becase they should either speed or slow.
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
3inchs
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
.7709961,1.62207,1.184998
** Your description of the pendulum's motion from release to the 2d hit: **
It begins to weaken and slow down
** Your description of the pendulum's motion from the 2d hit to 4th hit: **
it goes up and creates distance pick up speed and heads back down.
** 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: **
no it continues the same motion just with less energy.
** 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: **
lower swing of before later hit.
&#A full cycle of a free pendulum is from extreme point to equilibrium to opposite extreme point then back to equilibrium and finally back to (almost) the original extreme point.
The pearl pendulum is released from an 'extreme point' and strikes the bracket at its equilibrium point, so it doesn't get to the opposite extreme point.
Thus the period of the pendulum can be divided into four parts. From the steadiness of the rhythm we have good evidence that the motion between 'hits' takes the same time independent of the amplitude of the motion (the rhythm remains constant while the amplitude of the motion decreases). Theoretically each of the four parts of the cycle, as described above, takes the same time. Assuming this to be true, we can speak of the quarter-cycle from an extreme point to equilibrium or from equilibrium to an extreme point.
Through how many quarter-cycles does the pendulum move between release and the second 'hit'?
Through how many quarter-cycles does it move between the second and the fourth 'hit'?
What therefore should be the ratio of the time interval from 2d to 4th 'hit', to the interval from release to the 2d 'hit'?
How does this ratio compare with the results you just reported?
Does this constitute evidence for or against the theoretical hypothesis that the quarter-cycles all require the same time?
Suggested response title: description of motion of pearl pendulum &#
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** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
The speed at which it travels
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
because they slow bown but they also cover less ground meaning it is hard to determine if it should speed or slow.
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
it will swing depending on its length.
** **
35min
** **
You have reasonably good data. However you didn't answer a couple of the questions in the specified way, so be sure to see my notes above and do as instructed there.