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:

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

The sounds get closer together and the rhythm is faster. It is easy to hear this beat and the increase in taps.

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

It almost sounds constant but it slows down. The sounds are further apart than in the previous position. The taps are very sad sounding and slow.

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

I had to put a tiny shim under it to hear a more steady rhythm. It hit it 10 good times and 2 tint taps when it was soming to s reasting point.

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

first position, pearls facing me, the pendulum is swung and slows down.

Rotating 45 degrees cclock wise, the pendulum is relased and the rate still slows down.

Rotaing another 45 degrees ccw, the pendulum is swung and the rythm is constant.

Roatating another 45 degrees, the pearals should be facing away from you, the pendulum is released and the rhythm increases.

Rotate 45 degrees and release pendulum and rhythm is still increasing.

Roatate another 45 degrees and the rhytm is constant (the base of the bracket is parallel to you.

Rotate 45 degrees and the pendulum is released and the rythm has slowed down again.

Roate again and you are in your start position.

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

I would turn the base of the bracket parallel to me and that makes a more steady rhythm.

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

.4492188

.484375

.53125

.578125

.640625

.484375

.453125

.515625

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

.5, .441, .387, .422, .441

.527, .426, .700

.332, .355, .281, .316

.441, .293, .375, .516

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

8 1/2 cm

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

.45, .68, .44

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

It bounces sided to side slightly.

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

The pearl doesn't bounce away from the bracket as far this times.

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 hits become more centered and the hits are bringing the pearl closer to the bracket.

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:

There is little bouncing capability from the bracket with each extra hit.

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

We shouldn't. It seems like the beginning intervals should be longer since the pearl essentially has longer to travel to hit the bracket.

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

We sould exppect then to stay the same since in this position the pendulum produces a relatively steady rhythm.

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

When we rotated the bracket on the book, that is clearly evidence that a pendulum's swing does not solely matter what length the string is. The direction and level of the bracket is a factor.