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: **
** 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? **
1.3cm, 2 degrees
The 1st number is the distance the block traveled upon release and the 2nd number is the degrees it rotated.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of two dominoes: **
2.1, 2
2.5, 2
1.9, 1
2.0, 2
2.4, 2
The 1st number is the distance the block traveled upon release and the 2nd number is the degrees it rotated.
** Rubber band lengths resulting in 5 cm, 10 cm and 15 cm slides: **
8, 8.5, 9
The 1st number is the length that resulted in 5cm, the 2nd number is the length that resulted in 10cm, and the 3rd is for 15cm.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of four dominoes: **
2.3, 2
2.45, 1
3.2, 1
2.6, 1
2.5, 2
The 1st number is the distance the block traveled upon release and the 2nd number is the degrees it rotated.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of six dominoes: **
3.5, 2
2.8, 1
5, 2
3, 2
2.9, 1
The 1st number is the distance the block traveled upon release and the 2nd number is the degrees it rotated.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of eight dominoes: **
7.1, 5
5.1, 1
8.0, 3
5.4, 1
3.3, 2
The 1st number is the distance the block traveled upon release and the 2nd number is the degrees it rotated.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of ten dominoes: **
12, 7
11.6, 5
12.2, 7
8, 5
7.5, 4
The 1st number is the distance the block traveled upon release and the 2nd number is the degrees it rotated.
** 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: **
7.6cm, 2 dominoes, 2.18, .2588, .8284 ergs
7.7cm, 4, 2.61, .3471, 1.9836 ergs
7.9cm, 6, 3.44, .9127, 3.9216 ergs
8.1cm, 8, 5.78, 1.832, 8.7856 ergs
8.3cm, 10, 10.26, 2.308, 19.494 ergs
The 1st number is the length of the 1st rubber band, the 2nd number is the number of dominoes, the 3rd & 4th numbers are the mean and standard deviation and the 5th number is the energy. The energy is obtained by multiplying the distance moved by the Newtons from the 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: **
The slope is increasing from left to right at an increasing rate.
Slope is 8.08 / 18.67 = .43, vertical intercept is 1.85 N
The data points lay very close to the line, it appears to be a straight line relationship.
** Lengths of first and second rubber band for (first-band) tensions supporting 2, 4, 6, 8 and 10 dominoes: **
The slope is increasing from left to right at an increasing rate.
Slope is 7.22 / 48.4 = .15, vertical intercept appears to be in negative numbers.
The data points lay very close to the line, it appears to be a straight line relationship.
** Mean sliding distance and std dev for each set of 5 trials, using 2 rubber bands in series: **
7.7, 7.8
7.7, 7.8
7.9, 8.0
8.1, 8.2
8.3, 8.4
** 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: **
6.9, 1.025
7.96, .3578
6.9, .9434
9.283, 2.728
14.12, 1.221
** 1-band sliding distance and 2-band sliding distance for each tension: **
2.18, 6.9
2.61, 7.96
3.44, 6.9
5.78, 9.283
10.26, 14.12
** 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: **
Slope is increasing from left to right at an increasing rate, the vertical intercept is not known, it is in the negative digits.
Slope is 8.08 / 7.22 = .86, vertical intercept is in negative digits.
The data points lay fairly close to the line, it appears to be a straight line relationship.
** 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. **
The graphs reflect this hypothesis. The graphs increase at an increasing rate and remain fairly constant.
** How long did it take you to complete this experiment? **
3 hrs.
** Optional additional comments and/or questions: **