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' **
When tilted back the sounds are closer together. When setting straight the noises are far apart at first but then close together in the end. When tilted back they seem short the whole time, plus it does not strike as many times.
** Your description of the rhythm of the pendulum when tilted 'forward' **
The sounds are further apart and last longer.
** Your description of the process used to keep the rhythm steady and the results you observed: **
I leveled the bracket as much as possible and the rhythm was steady.
** Your description of what happened on the tilted surface (textbook and domino), rotating the system 45 degrees at a time: **
Facing left the sounds were about average length apart to what we have done already.
Facing to the top the sounds were a little closer together.
Facing right they were the same as facing left.
Facing the bottom the sounds were a little further apart.
** Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm: **
To the bottom facing down the slope.
** Your report of 8 time intervals between release and the second 'hit': **
.438
.477
.406
.430
.398
.438
.430
.438
This is the amount of time in seconds it took for the pearl to travel from release, hit the bar, bounce back, and hit the bar again.
** Your report of 4 trials timing alternate hits starting with the second 'hit': **
.492, .617, .336
.430, .414, .375
.445, .539, .492, .242
.438, .703, .336
The first time is from release to the second hit. The second from hit two to hit four and so on with even hits.
** The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous): **
8.95 cm
** Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging: **
.451, .567, .385, .242
** Your description of the pendulum's motion from release to the 2d hit: **
It travels a fourth of a full cycle by going from release to hit.
right, but release to 2d hit would involve an additional half cycle
** Your description of the pendulum's motion from the 2d hit to 4th hit: **
This time the pendulum goes from equilibrium to extreme back to equilibrium.
between 2d and 4th hit this happens twice
** 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: **
Between release and the 2nd hit, the pendulum travels from equilibrium to an extreme 3 times. From 2nd to 4th hit it travels the distance 4 times.
Right. Very good.
** 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: **
Its the same except it travels farther between the second and fourth.
** Your conjecture as to why a clear difference occurs in some intervals vs. others: **
Because the pendulum travels a shorter distance during the first interval.
** What evidence is there that subsequent intervals increase, decrease or remain the same: **
To decrease because the pendulum loses speed.
They shouldn't decrease because the pendulum was to be set up so that the rhythm remains constant.
** What evidence is there that the time between 'hits' is independent of the amplitude of the swing? **
It gives evidence against this hypothesis. This shows the length of a pendulums swing can decrease with the same length.
** **
1 hour
** **
&#Your work looks good. See my notes. Let me know if you have any questions. &#