Phy 231
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 rythem gets faster or the sounds get closer together
** Your description of the rhythm of the pendulum when tilted 'forward' **
The sounds get further apart or the rythem slows down
** Your description of the process used to keep the rhythm steady and the results you observed: **
I inserted a little piece of paper in the back of the bracket so that the ball bearly sits off the bracket, the pendulum hit the bracket about ten times before it quit being for the most part farely steady
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
The sounds seem to get further apart by the first step.
after rotating 45 degrees the sounds seem to be fairly constant. after rotating another 45 the sounds seem further apart. Another 45 the sounds are further apart. another 45 the sounds are further apart. another 45 the sounds are still further apart. another 45 the sounds are gettin back to more constant, but a little far apart. The last 45 the sounds seem to be constant.
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
I would orient the pendulum 90 degrees CCW of the orginial position to acheive the most regular beat.
** Your report of 8 time intervals between release and the second 'hit': **
0.484
0.500
0.422
0.500
0.453
0.438
0.453
0.453
Each of these numbers represent the time it took for the pearl to hit the metal the second time. they were obtained by hitting the timer when released and again when it hit the second time.
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
0.406,0.578,0.594
0.453,0.594,0.594
0.469,0.547,0.563
0.516,0.531,0.578
These numbers represent the 2nd, 4th, and 6th bounce of 4 different trials obtained by the timer program
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
9.9cm
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
0.461, 0.5625, 0.58225
** 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
This is different because the first hit starts at the extreme point and goes, but the 2nd hit starts at equilibrium so it gets one extra interval in between them.
** 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
this differs because from release it starts at the extreme where as the 2nd and 4th there are 4 intervals because it starts at 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
between the 4th and 6th hit there are also 4 intervals between the two
** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
it should be shorter becuase it has one less interval than the rest of them
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
we would expect intervals after the 2nd hit by every two hits to increase becuase there is one extra interval in between them.
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
this experiment shows that the further you start away from equilibrium the longer the intervals between them, but if you make the angle a shorter one the intervals will occur more frequently. Therefore the length of the swing determines the pendulums swing
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1 hour
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&#This looks very good. Let me know if you have any questions. &#