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 rythmn gets faster as the swings get shorter
** Your description of the rhythm of the pendulum when tilted 'forward' **
the rythmn is slower as the swings away from the pendulum is farther and farther apart
** Your description of the process used to keep the rhythm steady and the results you observed: **
position my pedulum on a desk board and adjusted the boards levelness to aquire a seady rythmn which i did lasting approximately 1 sec apart. ~10 hits
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
with the pendulum placed with the pearl at 6 o'clock releasing the pearl gives you a steady rythmn. rotating 45 degrees clockwise you begin to hear an increase in the rythmn by the rotating 45 degrees until pearl is returned to 6 o'clock.
At 12 o clock you will find a very rapid rate. each 45 degree turn up to this point was increasing, each point after this point is gradually decreasing until finding a steady rythymn back at 6 o'clock
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
i believe i wrapped this answer into theabove question so i'll copy :
with the pendulum placed with the pearl at 6 o'clock releasing the pearl gives you a steady rythmn. rotating 45 degrees clockwise you begin to hear an increase in the rythmn by the rotating 45 degrees until pearl is returned to 6 o'clock.
At 12 o clock you will find a very rapid rate. each 45 degree turn up to this point was increasing, each point after this point is gradually decreasing until finding a steady rythymn back at 6 o'clock
** Your report of 8 time intervals between release and the second 'hit': **
.344
.469
.492
.429
.453
.414
.492
.422
following the instructions and not to sound redundant ill copy them
click and release the pendulum simultaneously
the pendulum will strike the bracket but you won't click
the pendulum will strike the bracket a second time and you will click at the same instant
my data represents the clock time required for the pearl to leave the start line travel to the pendulum and ricocet back to me and return to the pendulum.
Very good. These results correspond very well with the pendulum length you reported below.
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
.914,1.047,1.453,1.336,1.523
.594,.820,.891,.945,.961,1.039
.429,.602,.695,.977,1.109,.1.055
.656,.898,1.078,1.344,.92,1.109, 1.109
these results are teh time required for a total revelation from start to start plus a hlf revelation, timing hit 2,4,6,8,10,ect.
These results do not correspond to a pendulum for which the rhythm remains constant. These 'hits' are getting further and further apart.
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
my length of pendulum is 7.8cm
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
.194,.188,.179
I believe you reported the time intervals for alternate 'hits' above. The results you report here appear to be the intervals between the intervals. They tell us by how much each time interval exceed the one before it.
If the pendulum has a steady rhythm, constant time between 'hits', then these numbers should be close to 0.
** Your description of the pendulum's motion from release to the 2d hit: **
the pearl should start at A hit B get to C pass back to B and end at A
we however start at A hit B and bonce back to A
On the second 'hit', or any other 'hit, the pendulum is not at its starting point A, it hitting the bracket at point B.
It can't pass beyond the point at which it hits the bracket. So it can't start at A, hit B and get to a point C. It hits at B, returns to A, then hits again at B, etc.
** Your description of the pendulum's motion from the 2d hit to 4th hit: **
the motion between hit 1 ond 2 is reciprocal energy transfered from the pendulum to the pearl as it hits it. the release to the first hit is accelerated velocity from the non constrictive fall (although the air does supply some friction and does remove some energy not enough to make a difference).
For this point in the course, this is a good description of the dynamics of the pendulum.
However you want to give a description in similar terms to those you gave previously, from A to B etc..
You might qualify this, since the pendulum bounces away less and less each time. As a reult the point A is not really a single point, but keeps getting closer and closer to the bracket. However you can still use the terminology 'A to B and back to A ...' etc.
** 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: **
as Im assuming the next question will ask the same question i will copy this box but will say that the energy we begin with will continue to desipate as it smacks into the bracket at point b in our pendulum fall
** 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 energy we begin with will continue to desipate as it smacks into the bracket at point b in our pendulum fall
** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
there are more energy in the begining then in te end since there are no other sources of eneregy only the bracket soaking in (or stealing) the pearls energy as it cuts through the friction in the air and hits off it after every rotation
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
decrease for sure
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
there is no way any sceitific experiment can depend on nothing else and be successful. there are other obligation to gravity, friction, and human error. this experiment proves that.
If you set the pendulum up so its rhythm stays constant, you will not be able to detect a difference in the time between 'hits'. Your timings will differ slightly, but this would be due to human error and to the limits of the accuracy of the TIMER.
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45mins
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You are doing some good thinking here.
However see my notes about setting the pendulum up to achieve constant rhythm, as instructed in the experiment, and see how your answers to these questions change.
Please respond with a copy of this document, including my comments, inserting your revisions and/or questions. Indicate insertions by &&&&.