pearl pendulum

Your work on pearl pendulum 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:

I am not sure if I did this right. I did it to the best of my understanding. I am not really sure that my data is correct.

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

Sounds get closer together. The rythym speeds up instead of remaining constant.

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

The rhythm becomes slower and further apart.

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

In order to make the pendulum steady it must be sitting on a flat and level surface. The ryhthm remained steady at a constant fast pace beat at around 18 beats.

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

When placing the pendulum on the elevated text books left and right corners the rythms change at different angles

1. When the pendulum is parrallel to the text book, the rythm is fast and the beats become closer together.

2. When rotated 45 degrees counter clockwise the rhythm becomes faster and the beats become closer together.

3. When rotated another 45 degrees the rhythm becomes faster.

4. When rotated another 45 degrees the rhythm is fast again.

5. When rotated another 45 degrees the rhythm remains fast.

6. When roated another 45 degrees the rhythm begins to slow down and the beats start to become further apart.

7. When rotated another 45 degrees the beats remain slower.

8. When rotated another 45 degrees the beats continue to remain slow.

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

When the pendulum is parallel, the beat is most regular.

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

.344

.422

.406

.438

.391

.469

.359

.297

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

.250,.240,.234,.230

.250,.281,.234,.230

.375,.781,.625,.547

.516,.406,.438,.344

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

8.3 cm

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

.10,.06,.04

-.31,.47,.04

-.406,.156,.78

.110,-.031,.94

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

is slower than the other hits

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

The motion becomes faster between the first beat and the second beat.

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 motion between the release and the second hit is slower between the second hit and the fourth hit.

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 between the second hit and the fourth hit differ from the fourth and sixth hit because it is slower.

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

Due to the position that the pendulum is placed.

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

increase

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

The swing also depends on the postion of the pendulum and the surface that it is sat on.