pearl pendulum_data

Your general comment, if any:

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

The rhythm gets faster when the pearl is pulled away and it is tilted forward. It goes Bang then a pauses then repetitive bangs. Very fast.

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

The rhythm gets slower when the pearl is pulled away and it is tilted forward. It goes Bang then a pauses then band then very long pause then a slight bang then nothing.

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

I did not pull the pendulum back too far because the farther I pulled it back the less consistent it was. The surface I was actually using was flat. The pendulum sped up a little towards the end but was pretty consistent. It hit 5 times.

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

Place a domino under the closed text book in the upper left and right corner. Find the middle of the top of the book and place the pendulum there and make it parallel to one of the end. Make sure that the pearl string is between the last two hole (closest to the bottom). Pull the pearl back a centimeter and release. Listen to the rhythm of the beats and record results. Then rotate the pendulum counterclockwise 45 degree and repeat. Making sure that the pendulum is in the center of the book at all times.

Starting position the beats were closer together. 45 degrees the beats were even more closer together. 90 degrees the beats were all about the same rhythm. 135 degrees the beats were farther apart. 180 degrees the beats were farthest apart 225 degrees the beats were slower (similar to 135 degrees). 270 degrees the beats all had the same rhythm (similar to 90 degrees). 315 degrees the beats were closer together (similar to 45 degrees)

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

I would place the pendulum at a 90 degree angle.

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

.320

.336

.422

.305

.344

.320

.336

.344

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

.516, .570, .625

.359, .539, .5

.547, .523, .711

.453, .594, .609

.383, .422, .477, .672

.438, .602, .570, .727

.508, .469, .586, .547

.391, .406, .516

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

5.3cm

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

0.439, 0.516, 0.4.99

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

The pendulum starts by being pulled away from the metal then released. The pearl swings on the string towards the metal in a curved way.

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

Once the pearl hits the metal it bounces off a little and then swings back towards the metal and hit is again.

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:

When you release the pendulum away from the metal the pearl has to swing on the string to get back to the metal. The pearl hits the metal and then bounces off and then swings back and hits the metal again. The first initial hit bounces off farther then when the pearl hit the third and fourth time. By bouncing off farther the pearl has more momentum to swing back and hit the metal. The bounces between the 2nd and 4th hit do not go as far and do not have as much momentum to return the pearl to the metal as quickly as the release to 2nd 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 bounces between the 2nd and 4th hit do go farther away from the metal because they still have some momentum. The motion between the fourth and sixth hit is very small because it does not have very much momentum to bounce off the metal and then return to the metal. The bounces get a tad closer together for the fourth and sixth bounce because they do not have as much of a distance to travel back to the metal as the second to fourth bounce do.

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

I would expect that the first time interval should be shorter than the subsequent time intervals because of the swing of the pearl. When it is pulled farther away it has more momentum to return to a neutral position (the pearl hanging).

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

I would expect subsequent time intervals to stay the same.

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

This lab proves that hypothesis that the length of a pendulum’s swing depends only on its length, and is independent of how far it actually swings is wrong. The length of a pendulum’s swing depends on the length and how far it actually swings. Depending on how long the pendulum is the swing correlates with it. If the pendulum length is long then the swing will be larger and vice versa. When you had to test to see which made the most consistent beats the shorter the pendulum the more consistent the beat was compared to when the pendulum was much longer. 13:04:01 01-29-2006