phy 121
Your 'energy conversion 1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** #$&* Your optional message or comment: **
3/27 at 3:30 p.m.
** #$&* How far and through what angle did the block displace on a single trial, with rubber band tension equal to the weight of two dominoes? **
2 cm
2-5 degrees
I pulled the dominoes back .5 cm, and these were the results.
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of two dominoes: **
2 cm
3 cm
3.8 cm
3.8 cm
3 cm
I pulled it back 1 cm for these results.
** #$&* Rubber band lengths resulting in 5 cm, 10 cm and 15 cm slides: **
2 cm, 3.5, 4 cm
These are the amounts that I pulled the dominoes back to get the slides desired.
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of four dominoes: **
4 cm
5cm
4 cm
5.5 cm
5 cm
I pulled back 1.5 cm.
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of six dominoes: **
6 cm
6 cm
5 cm
8 cm
5 cm
I pulled the dominoes back 2 cm for these results.
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of eight dominoes: **
7.5 cm
8 cm
9 cm
8.2 cm
7.4 cm
Stretched 2.5 cm for this.
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of ten dominoes: **
8.5 cm
9.5 cm
10 cm
8.5 cm
8 cm
Stretched 3 cm. for this.
** #$&* Rubber band length, the number of dominoes supported at this length, the mean and the standard deviation of the sliding distance in cm, and the energy associated with the stretch, for each set of 5 trials: **
7.7cm,2, 3.12, .7429, .19N
7.9cm,4,4.7, .6708, .38N
8.1cm,6,6, 1.225, .76N
8.4cm,8, 8.02, .6419, 1.14N
8.6cm,10,8.9, .8216, 1.52N
.59 Ncm, 1.79 Ncm, 4.56 Ncm, 9.14Ncm, 13.53Ncm
I don't think you've correctly calculated the energy associated with the stretch.
** #$&* Slope and vertical intercept of straight-line approximation to sliding distance vs. energy, units of slope and vertical intercept, description of the graph and closeness to line, any indication of curvature: **
.19, (0, -.50)
N/cm
The data points are close to the line.
There does appear to be a little curvature with increasing at an increasing rate perhaps.
** #$&* Lengths of first and second rubber band for (first-band) tensions supporting 2, 4, 6, 8 and 10 dominoes: **
** #$&* Mean sliding distance and std dev for each set of 5 trials, using 2 rubber bands in series: **
I'll be honest. I think I'll wait and see if these results are close to what you're looking for before I redo this all again. I've spent a couple hours on this already.
** #$&* Slope and vertical intercept of straight-line approximation to sliding distance vs. energy, units of slope and vertical intercept, description of the graph and closeness to line, any indication of curvature: **
** 1-band sliding distance and 2-band sliding distance for each tension: **
** #$&* Slope and vertical intercept of straight-line approximation to 2-band sliding distance vs. 1-band sliding distance, units of slope and vertical intercept, description of the graph and closeness to line, any indication of curvature: **
** #$&* Discussion of two hypotheses: 1. The sliding distance is directly proportional to the amount of energy required to stretch the rubber band. 2. If two rubber bands are used the sliding distance is determined by the total amount of energy required to stretch them. **
** #$&* How long did it take you to complete this experiment? **
Over 2 hours
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