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? **
1.3,0
The first number is the displacement of the domino block and the second is the rotation in degrees of the block.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of two dominoes: **
1.6,0
1.35,0
1.5,1
1.5,0
1.4,0
These numbers are the displacement of the domino block and the rotation in degrees that the block experienced from release to rest. The length of the rubber band was about 7.2cm in length, the length of the rubber band at 2 domino weight.
** Rubber band lengths resulting in 5 cm, 10 cm and 15 cm slides: **
7.4,7.7,8.0
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of four dominoes: **
3.5,0
3.8,0
3.9,0
4.1,0
4.0,0
These numbers are the displacement of the domino block and the rotation in degrees that the block experienced from release to rest. The length of the rubber band was about 7.3cm in length, the length of the rubber band at 4 domino weight.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of six dominoes: **
4.7,0
4.7,0
4.7,0
4.9,1
5.3,5
These numbers are the displacement of the domino block and the rotation in degrees that the block experienced from release to rest. The length of the rubber band was about 7.5cm in length, the length of the rubber band at 6 domino weight.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of eight dominoes: **
6.5,5
6.7,4
7.0,2
7.3,3
7.5,4
These numbers are the displacement of the domino block and the rotation in degrees that the block experienced from release to rest. The length of the rubber band was about 7.7cm in length, the length of the rubber band at 8 domino weight.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of ten dominoes: **
10.7,5
11.2,5
11.6,5
12.6,5
12.7,5
These numbers are the displacement of the domino block and the rotation in degrees that the block experienced from release to rest. The length of the rubber band was about 7.8cm in length, the length of the rubber band at 10 domino weight.
** 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: **
7.2,2,1.4 +- .1225,.27
7.3,4,3.86 +- .2302,1.47
7.5,6,4.86 +- .2608,3.69
7.7,8,7 +- .4123,7.98
7.8,10,11.76 +- .8735,17.88
The above data are in cm,dominoes,cm,Ncm
** 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: **
.57,2
The unit of the slope is N. The unit of the vertical intercept is cm.
The data does not seem to fit a line very well. Perhaps a curve that is concave down would be better suited.
** Lengths of first and second rubber band for (first-band) tensions supporting 2, 4, 6, 8 and 10 dominoes: **
.45,3
The units of the slope is N (cm/Ncm) and the units of the y-intercept is cm.
The data points seem to much closer to a line than previously.
** Mean sliding distance and std dev for each set of 5 trials, using 2 rubber bands in series: **
7.2,7.2
7.2,7.4
7.5,7.5
7.7,7.7
7.8,7.8
** 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: **
2.68,.27775
3.36,.2302
7.88,.3564
12.28,.9834
17.68,.2489
** 1-band sliding distance and 2-band sliding distance for each tension: **
1.4,2.68
3.8,3.36
4.8,7.88
7,12.28
11,17.68
** 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: **
1.75,-1.5
The slope has no units (cm/cm) and the units of the vertical intercept are cm.
The graph of the line matches the data fairly well.
** 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 think that the first set of data had some problems, but that the second set does support the hypothesis because the graph does resemble linearity, implying proportionality between the energy and stretch of the rubber band.
** How long did it take you to complete this experiment? **
I had trouble getting consistent results in the first half of the experiment. The entire lab took me about 4 hours to get results that I could be reasonably confident were not extremely messed up.
** Optional additional comments and/or questions: **
You did excellent work and appear to understand everything completely. Let me know if you have any questions.