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Hello Prof. Smith,
Here is my Energy conversion 1 lab, review.
Tanya
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?
7 mm, 20 deg
5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of two dominoes:
10, 21
9, 18
8.6, 18
9.2, 19
9, 19
Rubber band lengths resulting in 5 cm, 10 cm and 15 cm slides:
8.8, 9.7, 10.9
18, 35, 45
5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of four dominoes:
11, 1
10, 0
9.7, 0
9.5, 0
10.5, 0
5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of six dominoes:
12.5, 0
11.3, 0
12, 0
12, 0
11.8,0
5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of eight dominoes:
13, 0
13, 0
12.8, 0
13.1, 0
12.9, 0
5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of ten dominoes:
13.5, 0
13.6, 0
13.5, 0
13.4, 0
13, 0
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:
9.4, 2, 9.16, .5177, 21.526 J
9.3, 4, 10.14, .6107, 23.5755 J
9.25, 6, 11.92, .4324, 27.565 J
9.1, 8, 12.96, .1140, 29.484 J
9, 10, 13.4, .2345, 30.15 J
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:
2.25, 19.5
J / cm, J
1 mm, a straight-line is from 9.16 to 10.14, a curvature is from 10.14 to 13.4
The graph is increasing at a decreasing rate
Lengths of first and second rubber band for (first-band) tensions supporting 2, 4, 6, 8 and 10 dominoes:
6.3141, 38
J / cm, J
3 mm, a curvature from 8.9 to 9.55
The curvature is increasing at an increasing rate
Mean sliding distance and std dev for each set of 5 trials, using 2 rubber bands in series:
8.8, 2, 9
9, 4, 9.2
9.2, 6, 9.4
9.25, 8, 9.5
9.5, 10, 9.6
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:
8.9, .1414
9.1, .1414
9.3, .1414
9.375, .1768
9.55, 0.07071
1-band sliding distance and 2-band sliding distance for each tension:
2, 7, 12.6
4, 7.6, 13
6, 7.9, 13.5
8, 8.1, 14.3
10, 8.3, 15
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:
1.807, 11.5
cm, cm
The curvature is from 7 to 8.3
The graph is increasing at an increasing rate
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.
Yes, my observations support the hypothesis that the sliding distance is directly proportional to the amount of energy required to stretch the rubber band.
How long did it take you to complete this experiment?
Optional additional comments and/or questions:
Your modifications are acceptable overall, but the units are still not completely correct. You would be working in fractions of a Joule in this experiment.