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? **
.9,0
this is the distance traveled by the block when the rubber band is stretched to 7.3cm, the block did not rotate during this distance
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of two dominoes: **
1,2
1.2,3
.9,0
1.2,3
1,2
these are the numbers in cm of the five trials pull the band to the original length of 7.3cm, these are the distances traveled by the block on each trial, and the second number is the number of degrees the block rotates
** Rubber band lengths resulting in 5 cm, 10 cm and 15 cm slides: **
7.6,7.8,8.5
all were within the 30% stretch
these are the band lengths to propell the block the given distances
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of four dominoes: **
6,10
6.3,13
6.2,12
6.25,12
5.6,8
these are the distances traveled by the block on each trial when the band was stretched to 7.8cm
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of six dominoes: **
6.5,10
7.4,12
8.5,15
8.8,15
7.4,12
these are the distances traveled by the block on each trial when the band was stretched to 7.9cm
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of eight dominoes: **
12,10
12.5,10
12.7,10
11.3,10
11.2,10
these are the distances traveled by the block on each trial when the band was stretched to 8.3cm, the block is rotating very little
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of ten dominoes: **
14.5,10
14.8,15
14.9,12
15.8,15
15.4,10
these are the distances traveled by the block on each trial when the band was stretched to 8.5cm, the block again rotates very little
** 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: **
7.8,4,6.07,.2864,8.892
7.9,6,7.72,.9311,9.006
8.3,8,11.94,.6804,12.616
8.5,10,15.08,.5167,16.15
the units used for energy were N*cm, the results were obtained by multiplying each length by the coresponding Newtons from the previous experiment with calibration of rubber bands
You wouldn't multiply the length of the rubber band by the force, because the force doesn't act through a distance equal to the length. You multiply the average force by the distance through which the force actually acts, as in the force vs. displacement 1 lab exercise.
** 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: **
1.2,4
Ncm^2
the cluster of points appear to indicate some sort of curve, it appears to be increasing at an increasing rate
** Lengths of first and second rubber band for (first-band) tensions supporting 2, 4, 6, 8 and 10 dominoes: **
.93125,2.1
y is Ncm and slope is Ncm^2
the points seem to indicate a straight line relationship
** Mean sliding distance and std dev for each set of 5 trials, using 2 rubber bands in series: **
7.8,8
7.9,8.1
8.3,8.5
8.5,8.7
** 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: **
6.07,.2864
7.72,.9311
11.94,.6804
15.08,.5167
** 1-band sliding distance and 2-band sliding distance for each tension: **
1,1.3
2.1,6
2.8,6.5
4.5,12
5.9,14.5
** 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: **
2.46,0
the units of both quantities will be cm
this seems to indicate straight line behavior
** 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 the hypothesis is supported because the sliding distance is greater with 2 bands
** How long did it take you to complete this experiment? **
3hr
** Optional additional comments and/or questions: **
i'm not sure if i had this experiment setup correctly, i think i was right with the one band setup but the 2 band setup i didn't know where to attach the second band, i attached it directly with the first band, i wasn't sure where to measure each from, i measured the distance from where the center of the block was when pulled back to the center of the block when it cam to rest
Your setup was fine, and you have good data. You made a couple of errors in the analysis, so you should see the link below. However I'm not asking for a revision on this, unless you have questions.