pearl pendulum_data

Your general comment, if any:

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

The sounds get closer and closer together. The rhythm also gets faster.

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

It strikes the bracket less and less frequently. The sounds get further and further apart. The rhythm gets slower.

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

I placed the bracket on a level surface and the rhythm got faster, so i tilted the bracket forward just a little to make the rhythm steady.

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

First put one domino under each of the top and left and right corners of a closed textbook. I placed the bracket in the middle of the book with the base parallel to one of the sides of the textbook. The sounds remain overall steady. I rotated the bracket 45 degress counterclockwise and released the pearl, the rhythm also remained steady. I rotated it another 45 degrees and released the pearl, this time the rhythm got a little faster. I rotated it another 45 degrees, and the rhythm also got a little faster. I rotated it two more times to get it back to the origin and one time it got faster then the second time it remained steady.

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

I would leave the bracket on the book in the origin in which i placed it, it seems to have the most steady rhythm.

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

.266

.312

.266

.281

.250

.265

.313

.288

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

.250, .640, .671, 1.062

.734, .765, .843

.656, .687, .828

.234, .641, .5

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:

.39, .031, .391

.031, .078

.031, .141

.407, -.141

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

The motion between the release and the first hit is the most constant hit, after that they get faster but shorter.

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

It gets faster, and less constant

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:

it is the fastest 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:

N/A

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

All of the time intervals were about the same.

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

Because you are releasing the pendulum and still counting the time from the 2nd 4th and 6th hit.

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

I think that the length of a pedulum does depend on the length of the swing. The swings are longer than if the pendulum was shorter. 13:04:15 01-29-2006