20090529, 01:05  #1  
Dec 2008
1501_{8} Posts 
Bungee Survivor Question
Hi,
So I have a final lab in my college physics class. And the lab procedure is as follows: Quote:
I have attached my data as a text file (I can't upload Excel files apparently): AP Physics Post Lab.txt. My question is, what formula does k follow (it is most definitely not linear)? Thus, once I find k, it should hopefully be easy to compute this minimum height using energy considerations (please let me know if I am somehow wrong): , Since the object is released from rest, , where is the minimum height (the thing I need to calculate), m is the mass of the jumper = 0.25837 kg. is the initial length of the bungee which I measured to be 0.395 meters. Last fiddled with by flouran on 20090529 at 01:43 

20090529, 01:11  #2 
Dec 2008
7^{2}×17 Posts 
I have also attached a graph of the empirical computation of k (yaxis) versus the attached mass in kilograms (xaxis). As you can see, k asymptotically approaches 4 N/m, but is nonlinear. I estimate k to be around 7 N/m if the bungee jumper is attached.

20090529, 20:46  #3 
Dec 2008
7^{2}×17 Posts 
Well, we did the experiment. And my computations were correct! Yay!
Last fiddled with by flouran on 20090529 at 20:47 Reason: Grammar Error. I initially posted: "And I my computations were correct!" as opposed to "And my computations were correct!" 
20090530, 02:07  #4 
"Lucan"
Dec 2006
England
6474_{10} Posts 
Rubber bands also exhibit considerable hysteresis:
the height attained after the initial descent is nowhere near the starting point. Last fiddled with by davieddy on 20090530 at 02:08 