pearl pendulum_data

Your general comment, if any:

The experiment may be flawed do to human error, especially in the step of placing dominoes under the text book. Those instructions might have been misunderstood. If no corrections are needed in the measurements, please explain how the results prove the hypothesis. Thank you.

Your description of the rhythm of the pendulum when tilted 'back'

the sounds get closer

Your description of the rhythm of the pendulum when tilted 'forward'

they become further apart

Your description of the process used to keep the rhythm steady and the results you observed:

placed a folded paper under the back end.

paper was folded three times.

Your description of what happened on the tilted surface, rotating the system 45 degrees at a time:

Place the dominos at the top corners, I rotate the bracket approximately 45 degrees. Results show that the close the front is to being tilted back, the faster it comes to rest.

Additionally, the closer it is to being tilted forward, it slows to the point that it no longer bounces. However, the closer it is to the left or right side, the pendilum is at a steady beat until it comes to a rest.

Your description of how you oriented the bracket on the tilted surface to obtain a steady rhythm:

From the left or right side.

Your report of 8 time intervals between release and the second 'hit':

1 140.4922

2 140.8633 .371

3 148.5156 7.652

4 148.8125 .297

5 154.4609 5.648

6 154.832 .371

7 160.6211 5.789

8 160.9492 .328

9 253.7461 92.797

10 254.0859 .340

11 263.4375 9.352

12 263.7578 .320

13 268.2656 4.508

14 268.5156 .250

15 273.5625 5.047

16 273.875 .313

Your report of 4 trials timing alternate hits starting with the second 'hit':

it fluctuates around the same rythim.

The length of your pendulum in cm (you might have reported length in mm; the request in your instructions might have been ambiguous):

8.5 cm

Your time intervals for alternate 'hits', starting from release until the pendulum stops swinging:

.34

.41

.45

Your description of the pendulum's motion from release to the 2d hit:

linear

Your description of the pendulum's motion from the 2d hit to 4th hit:

faster but with shorter distance

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:

faster but still has shorter distance

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:

almost coming to a rest, but still, the rate at which the beat increases is more steady than when it is tilted up.

Your conjecture as to why a clear difference occurs in some intervals vs. others:

I think that the kenetic energy is lost on impact so the first interval would be longer, do to the fact that it built up enough positive energy to bring it to nearly the same point as release.

What evidence is there that subsequent intervals increase, decrease or remain the same:

decrease.

What evidence is there that the time between 'hits' is independent of the amplitude of the swing?

the near perfect rythim for the pearl indicates that length builds up the positive energy regardless of distance. 13:04:14 01-29-2006