Phy 201
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' **
Sounds get closer and the rhythm gets faster when the bracket is tilted back
** Your description of the rhythm of the pendulum when tilted 'forward' **
when tilted forwards,the sounds become further apart,rhythm gets slower,pearl strikes less and less frequently with each bounce.
** Your description of the process used to keep the rhythm steady and the results you observed: **
i used a note book to get the pearl barely touch the bracket.I couldn't get the steady rhythm.
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
I took the Textbook and kept two domnos, on eon each side of the book(vertically).Then i placed the pendulum bracket on the book with the base parallel to the opposite side(horizontal) of the dominos.
pendulum released-the sound was loud and the frequency was getting less.
Rotated 45 degree-less freuency compared to earlier and the sound was less..
Rotated 45degrees-frequency was less than 1st but more than 2nd
Rotated 45somewhat similar to 3rd one
Rotated 45 degrees=-somewhat similar to 1st one
Rotated 45degrees-loudest noise and higher frequency.
Rotated 45 degrees- less frequency
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
Perpendicular to the dominos,but pendulum facing the dominos side
** Your report of 8 time intervals between release and the second 'hit': **
1 117.8906 117.8906
2 118.5156 .625
3 118.7969 .28125
4 119.0781 .28125
5 119.2969 .21875
6 119.6094 .3125
7 119.8125 .203125
8 120.0625 .25
The numbers were obtained by cliking on the click to time event at the same time as the pendulum was released and then i did my best to clik with the times i heard the second and the remaining times the pearl hit the bracket.
My pendulum stopped at 10th clik.
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
.328,.265,.234,.25,.29,.31,.29,.37,.17,.31
the results to me mean that the time gap between each time pearl hits the bracket is widening.
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
9cm
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
.32,.094,.056
** Your description of the pendulum's motion from release to the 2d hit: **
2
** Your description of the pendulum's motion from the 2d hit to 4th hit: **
4
** 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: **
6
** 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: **
8
** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
less no of extreme to equilibrium point intervals
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
increase and then stay the same
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
Not very sure,but i think it only depends on the length of the pendulum.None of the time intervals had any thing to do with how far it actually swings.
** **
1 hour 30 minutes
** **
&#Good work. Let me know if you have questions. &#
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