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? **
0.5cm, 0deg
The values above represent the distance that the block travel at the rubberband length required to support 2 dominoes, adn the degrees of rotation at the end of travel.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of two dominoes: **
.5cm, 0deg
.5cm, 2deg
.6cm, 2deg
.6cm, 4deg
.5cm, 5deg
By stretching the rubberband to the length required to support 2 dominoes, the values above are the distances travel due to the force of the rubberband and the angle of rotation during travel.
** Rubber band lengths resulting in 5 cm, 10 cm and 15 cm slides: **
7.9cm, 8.3cm, 8.7cm
N/A
The 3 values above are the amount rubberband stretch needed in order for the domino block to travel 5cm, 10cm, and 15cm respectively. The second line indicates that all the angles of rotation were within 30 degress.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of four dominoes: **
2.2cm, 11deg
2.3cm, 14deg
2.3cm, 10deg
2.2cm, 11deg
2.5cm, 8deg
The values above are the distances traveled from the force of the rubberband required to support 4 dominoes.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of six dominoes: **
2.5cm, 11deg
3cm, 7deg
3.1cm, 8deg
3cm, 9deg
3.3cm, 7deg
The values above are the distances traveled from the force of the rubberband required to support 6 dominoes.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of eight dominoes: **
5.5cm, 10deg
6cm, 11deg
6.3cm, 11deg
6.1cm, 11deg
6.5cm, 11deg
The values above are the distances traveled from the force of the rubberband required to support 8 dominoes.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of ten dominoes: **
11cm, 10deg
11.6cm, 17deg
11.7cm, 15deg
11cm, 12deg
12.1, 16deg
The values above are the distances traveled from the force of the rubberband required to support 8 dominoes.
** 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: **
7.25cm, 2, 0.54cm, .05, .07Ncm
7.65cm, 4, 2.3cm, .12, .30Ncm
7.85cm, 6, 2.98cm, .29, .49Ncm
8.05cm, 8, 6.08cm, .38, .76Ncm
8.35cm, 10, 11.48cm, .48, 1.27Ncm
** 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: **
17.5, -11.75
N, cm
The points are close to the line, but there appears to be curvature.
It seems to be increasing at an decreasing rate.
Sliding distance is in cm, energy in N cm. Units of the slope of a graph of sliding distance vs. slope would not be N. The units would be cm / (N cm) = 1/ N or N^-1.
From your data the slope looks closer to 10 N^-1.
** Lengths of first and second rubber band for (first-band) tensions supporting 2, 4, 6, 8 and 10 dominoes: **
20.8, -13.08
N, cm
The points are pretty close to the line on either side, but show curvature. The curve appears to be increasing at a decreasing rate.
** Mean sliding distance and std dev for each set of 5 trials, using 2 rubber bands in series: **
7.25cm, 7.25cm
7.65cm, 7.7cm
7.85cm, 7.85cm
8.05cm, 8.1cm
8.35cm, 8.35cm
** 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: **
0.58cm, .04
2.76cm, .15
6.3cm, .12
11.1cm, .7
14.6cm, .52
** 1-band sliding distance and 2-band sliding distance for each tension: **
0.54cm, 0.58cm
2.3cm, 2.8cm
2.98cm, 6.3cm
6.1cm, 11.1cm
11.5cm, 14.6cm
** 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: **
11.1, 0.43
N, cm
The slope almost cuts the 2 graphes down the middle.
The slope of the data you present above would be around 1.3 or so; it wouldn't be close to 11.1.
** 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 this experiment and the data collected supports the hypothesis. The more energy required to stretch the rubberband, the farther the block slide distance.
** How long did it take you to complete this experiment? **
2hr
** Optional additional comments and/or questions: **
Good work overall, but see my notes and be sure to let me know if you have questions.