pearl pendulum_data

Your general comment, if any:

I have not received my books or physics kit yet, it was ordered over a week ago. I will need to check with the bookstore tomorrow. I will do my best with the experiments. I would like to repeat this one once I have my lab kit, as I have a feeling the pendulum I created moved too much.

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

With the pendulum untilted, the sounds get closer together, or the rhythm gets faster.

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

The sounds get closer together a lot quicker than when the pendulum was not tiltd. The rhythm gets faster.

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

The pendulum hit the bracket approximately 12 times. It was a very steady rhythm. I have it tilted slighty away from the magnet, to where the pearl is barely touching the bracket.

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

Bracket base is parallel to the side of the book, it swings at a steady rhythm.

45 deg - still steady

90 deg - still steady

135 deg - rhythm gets faster

180 deg - rhythm gets faster

225 deg - rhytm gets faster

270 deg - rhytm gets faster

315 deg - rhytm gets faster

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

I would orient the bracket to have a slight til toward the lower half of the book, similar to attempting to have it on a completely level surface, so that the pearl is barely touching if slightly away from the bracket.

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

Time between release of pendulum and 2nd hit:

Interval 1 .609

Interval 2 .641

Interval 3 .672

Interval 4 .657

Interval 5 .797

Interval 6 .719

Interval 7 .672

Interval 8 .594

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

Interval 1: .828, .938, .969, .953, .984, 1.328

Interval 2: .797, .984, .969, .953, 1.102, 1.266

Interval 3: .828, .969, 1.016, 1.188, 1.047

Interval 4: .735, 1.031, 1.078, 1.016. 1.125, 1.48

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

22.6 cm

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

2nd hit).797

4th).981

6th) 1.008

8th)1.028

10th)1.065

12th) 1.358

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

The pendulum has a farther distance to travel from the release point, versus the first hit. It is released at a 90 deg. angle from the top of the bracket, and for the first hit, it drops to a 45 deg. angle. It's covering more distance and moving faster.

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

Once again, the angle lessesn from the first and the second hit. Even though it's covering more distance, it's traveling faster.

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 difference in angles between the release and the second hit was about 1/2. Between the 2nd and 4th, the change in angle lessens.

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:

Like I explained above, the angles decrease with each hit. The difference in angles between the 2nd and 4th hit, are greater than those between the 4th and 6th. Smaller distances to cover, and the speed is slowing down.

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

Because it is moving the fastest of the pendulum swings, starting at the greatest angle from the bracket. It starts slowing down and decreasing in angle with the later intervals.

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

If all things remain unchanged, they should stay about the same. I think my pendulum moved slightly between intervals, it wasn't as steady as a bracket, hence the variance.

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

I think this does not support that hypothesis, its supports the opposite. It appears that the length is dependent on how far it swings. The greater the angle the faster the pendulum swings. 13:04:27 01-29-2006