Mini Experiment # 3
You have good data.
Did you graph force vs. length for each rubber band? Note that there are questions that should be answered concerning these graphs.
Be sure to keep your data for this experiment.
What was done in conducting the experiment
o First, I set up the rubber bands 1, 3, 4, and 5 on “S” Hooks and attached a baggy to one end. Next, I hooked one of the end hooks to a hook in the ceiling to eliminate some of the possible human error. I made a table with the rubber band #s going across the top and the # of tub fulls going down the left hand column(I also added the newtons in .21 increments for every tub full). Finally, I added one tub of water at a time, recording the measurement of each band until I got close to 30% of the longest band’s unstretched length.
Quantities And Values Recorded
Band #1 Band #3 Band # 4 Band # 5
1 tub = .21 N 8 8.3 8.2 7.4
2 tubs = .42 N 8.3 8.7 8.4 7.7
3 tubs = .63 N 8.7 9.0 8.8 8.1
4 tubs = .84 N 8.9 9.4 9.3 8.6
5 tubs = 1.05 N 9.3 9.7 9.6 8.8
6 tubs = 1.26 N 9.85 10.2 10 9.2
7 tubs = 1.47 N 10.3 10.7 10.5 9.9
Analysis and Conclusion
o After scetching graphs for all four bands, it can definitely be seen that all four took their share of the newtons. To me, what is most compelling is that the smallest of the four bands stretched more proportionally than any other band. Perhaps the smaller the band, the less strength the band has.