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: **
Would like to have feedback. Thanks, Joshua
** Your description of the rhythm of the pendulum when tilted 'back' **
They seem to sound the same or constant.
** Your description of the rhythm of the pendulum when tilted 'forward' **
The rythm stays steady the sound of the pearl striking the bracket gets quieter each time it strikes the bracket. The pearl strikes the bracket more times this way.
** Your description of the process used to keep the rhythm steady and the results you observed: **
By using pieces of notebook paper i was able to shim the bracket to the point to which the appeared to be steady. I heard six audible strikes of th epearl against the bracket.
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
After setting the experiment up as directed, I placed the bracket on the book with the pearl towaards the righ tside of the book and noted the position as 0degrees. The sounds seemed to stay about the same rythm as beforeand was the same at 180 degrees. Rotating clockwise 45 degrees the rythm lessened as it did at 135 degrees. At 90 degrees the rythm was the slowest. At 225 degrees and 315 degrees the rythm had a faster pace. At 270 degrees the rythm had it fastest pace.
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
To gain the most regular rythm and free flowing rythm i would set the bracket at either 0 or 180 degrees.
** Your report of 8 time intervals between release and the second 'hit': **
.40625
.40625
.46875
.4375
.453125
.4375
.484375
.4375
These are the time intervals for the second hit of the pearl pendulum. They were obtained by releasing the pearl and starting the timer simultaneously. When the second strike was heard I clicked th einterval button on the timer.
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
.390625,.34375,.3125
.4375,.421875,.375
.328125,.328125,.3125
.421875,.390625,.375
.375,.34375,375
.453125,.4375,.390625
.4375,.40625,,.390625
.34375,.359375,.34375
These are the time intervals for the second and the fourth hits of the pearl pendulum.
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
6.985 cm
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
0.40,0.38,.36
** Your description of the pendulum's motion from release to the 2d hit: **
The pearl is released from an extreme point and at its equilibrium it strike the bracket and returns to the direction of its original extreme point.
** Your description of the pendulum's motion from the 2d hit to 4th hit: **
The pearl returns in the direction of the orignal extreme point but probably not all the way to the opriginal extreme point. Rather it will reach a new extreme point which is a fraction of the original. Once it reaches the new extreme point it will return towards the bracket to strike it again.
** 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: **
The pearl returns in the direction of the second extreme point but probably not all the way to the second extreme point. Rather it will reach a new extreme point which is a fraction of the second extreme point. Once it reaches the new extreme point it will return towards the bracket to strike it again.
** 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 motion stays the same in terms of direction. The change is found in the distance to which the peral travels to each extreme point. Also the audible strikes soften each time.
** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
I acutally found the time intervals to be longer starting out and then shorter with more strikes. Possibly human error.
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
i think that we should expect th eintervals to decrease since the speed of the pearl should be slowing down, although the distance that the pearl needs to travels is lessened. Maybe the two cancel each other out and th time intervals should stay about the same.
If the system was set up correctly, so that the rhythm stays the same, this will be the case.
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
I think that thisd proves that a pendulum's swing is limited to length between it's extreme points which are limited to the length of the pendulum.
** **
1.5 hours
** **
Would like to have feedback. I did not have the supplies for this experimnet from the lab kit. I purchased the fake pearl and some beading needles from a local craft store. The bracket was made from a piece of metal and the pearl as harnessed by electrical tape.
Results may vary from the results that I would have had with the material from the lab kit.
Thanks,
Joshua
Good improvisation.
Do you have the standard lab kit? If not, you should call the bookstore and get one. If you do, the parts should have been with it; send me a list of what you did get.
Note that the release to 2d 'hit' should have been 3/4 as long as alternative subsequent intervals (extreme to equilibrium to extreme to equilibrium is three quarter-cycles; between alternate subsequent 'hits' is four quarter-cycles).