Phy 201
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: **
** 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? **
5.1,28
The first number in the first line is the distance in cm that the dominoes traveled as measured with a ruler. The second number in the first line is the number of degrees the dominoes rotated in the travel as measured with a protractor.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of two dominoes: **
5.5,19
6.3,22
5.7,21
5.6,20
4.7,19
The above results are the distance the dominoes traveled in cm in the five trials, and the degrees that the dominoes rotated through in each of those trials. The distance was measured with a ruler and the degrees were measured with a protractor.
** Rubber band lengths resulting in 5 cm, 10 cm and 15 cm slides: **
9.8, 10.5, 11.0
The above results are the lengths in cm the rubber band had to be stretched to to obtain a traveling distance of 5,10,and 15 cm for the dominoes.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of four dominoes: **
5.1,11
7.4,13
8.0,10
6.8,12
6.9,12
The above results are the distance the dominoes traveled in cm in the five trials (of being pulled back so the tension in the rubber band was equal to that of supporting 4 dominoes), and the degrees that the dominoes rotated through in each of those trials. The distance was measured with a ruler and the degrees were measured with a protractor.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of six dominoes: **
11.1,16
8.6,13
8.7,13
10.5,15
10.7,15
The above results are the distance the dominoes traveled in cm in the five trials (of being pulled back so the tension in the rubber band was equal to that of supporting 6 dominoes), and the degrees that the dominoes rotated through in each of those trials. The distance was measured with a ruler and the degrees were measured with a protractor.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of eight dominoes: **
11.7,10
11.8,10
12.9,11
13.3,11
11.1,10
The above results are the distance the dominoes traveled in cm in the five trials (of being pulled back so the tension in the rubber band was equal to that of supporting 8 dominoes), and the degrees that the dominoes rotated through in each of those trials. The distance was measured with a ruler and the degrees were measured with a protractor.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of ten dominoes: **
11.7,8
18.1,5
15.5,7
16.9,6
17.2,5
The above results are the distance the dominoes traveled in cm in the five trials (of being pulled back so the tension in the rubber band was equal to that of supporting 10 dominoes), and the degrees that the dominoes rotated through in each of those trials. The distance was measured with a ruler and the degrees were measured with a protractor.
** 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: **
9.8,2,5.56,.573,2.113
10,4,6.84,1.083,5.198
10.2,6,9.86,1.150,11.240
10.5,8,12.16,.910,18.483
10.8,10,15.88,2.516,30.172
The units for energy are Ncm. The first result in each line are the lengths in cm the rubber band was stretched to support the number of dominoes (the second results in each line). The third result in each line is the mean distance traveled by the dominoes in cm of the five trials. The fourth result in each line is the standard deviation of distance traveled by the dominoes in cm of the five trials. The fifth result in each line is the energy associated with the stretch of the rubber band and was determined by multiplying the mean of the trial by the force (.38,.76,1.14,1.52,1.9N) associated with the corresponding number of dominoes.
** 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: **
0.3671,5.1257
cm/Ncm,cm
The data points indicate a relatively straight line with an Rsquared value of 0.99.
** Lengths of first and second rubber band for (first-band) tensions supporting 2, 4, 6, 8 and 10 dominoes: **
.3738,9.0903
cm/Ncm,cm
All of the data points expect the first one are pretty linear with an R squared value of 0.924. The lowest point is off which throws off the line.
** Mean sliding distance and std dev for each set of 5 trials, using 2 rubber bands in series: **
9.8,8.1
10,8.5
10.2,8.6
10.5,9.0
10.8,9.5
** 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: **
7.32,1.064
15.44,1.426
19.28,1.038
21.0,1.177
27.54,0.182
** 1-band sliding distance and 2-band sliding distance for each tension: **
5.56,7.32
6.84,15.44
9.86,19.28
12.16,21.0
15.88,27.54
** 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: **
.5305,.45
cm/cm,cm
The points are decreasing then increasing on the graph witha an R squared value of .907.
** 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. **
I believe this experiment supports this hypothesis because the graphs are practically linear.
** How long did it take you to complete this experiment? **
2 hours
** Optional additional comments and/or questions: **
&#This looks very good. Let me know if you have any questions. &#