Search found 20 matches

by joiemoie
September 4th, 2015, 3:56 pm
Forum: Wind Power B/C
Topic: Wind Power B/C
Replies: 351
Views: 58015

Re: Wind Power B/C

If this is using max voltage rather than max power, this will definitely be a big game changer. Once again, the focus will be on speed then.
by joiemoie
April 18th, 2015, 5:45 pm
Forum: 2015 Build Events
Topic: Bungee Drop C
Replies: 88
Views: 15231

Re: Bungee Drop C

Has anybody figured out a better solution than mass data collection? We can't find any 10m heights to test from...but it doesn't seem like anybody is willing to share if they have figured out an accurate equation that actually works... any ideas ? Wellll sophia maybe if you actually tried the equat...
by joiemoie
March 22nd, 2015, 4:00 pm
Forum: 2015 Build Events
Topic: Bungee Drop C
Replies: 88
Views: 15231

Re: Bungee Drop C

Ok I derived a new equation for fully elastic bungee considering the fact that the bungee cord isn't massless. It makes a big difference. a = length of unstretched bungee b = length of stretch p = mass of bungee per meter length lambda: http://scioly.org/wiki/math_files/5/0/7/5078904f2d74299846933ae...
by joiemoie
March 22nd, 2015, 12:34 pm
Forum: 2015 Build Events
Topic: Bungee Drop C
Replies: 88
Views: 15231

Re: Bungee Drop C

Hi there everyone! Just thought I'd check in with some things I figured out only a few days before the competition, and how my state competition was. So, the equation doesn't work with masses at the extremes--and I can't believe I didn't realize this at all before. At low masses, the weight of the ...
by joiemoie
March 1st, 2015, 8:19 pm
Forum: 2015 Build Events
Topic: Bungee Drop C
Replies: 88
Views: 15231

Re: Bungee Drop C

Ok, new breakthrough. Partially elastic bungees are terrible and will deviate from hooke's law VERY EARLY. Hooke's law for rubber material is dependent on strain, aka the stretch length / length of bungee cord. However, for higher drop heights, strain becomes higher. At a certain strain, hooke's law...
by joiemoie
March 1st, 2015, 10:35 am
Forum: 2015 Build Events
Topic: Bungee Drop C
Replies: 88
Views: 15231

Re: Bungee Drop C

I have a question. My partner and I have been wondering how the Acton sheet containing the formula is better than just using the formulas for conversion from potential to kinetic. For some reason, when we use the PE to KE we are always off by like 40 cm. Initially, we thought that it might be becau...
by joiemoie
February 25th, 2015, 3:32 pm
Forum: 2015 Build Events
Topic: Bungee Drop C
Replies: 88
Views: 15231

Re: Bungee Drop C

Yeah I was going to do a quadratic but I plotted them and it was pretty dang planar. I was able to derive the equation by taking the differential vectors of 2 points on the plane and calculating their cross product and substituting into the general equation of a plane. 6th place at regionals beatin...
by joiemoie
February 22nd, 2015, 5:43 pm
Forum: 2015 Build Events
Topic: Bungee Drop C
Replies: 88
Views: 15231

Re: Bungee Drop C

Here's also something else to note, for all you people using the equations. K is only constant up to a certain point. At a certain point it in fact will deviate from hooke's law, and at a point less than ideal. At that point you need to find k as a function of x2, and adjust accordingly. I updated t...
by joiemoie
February 20th, 2015, 9:02 pm
Forum: 2015 Build Events
Topic: Bungee Drop C
Replies: 88
Views: 15231

Re: Bungee Drop C

Also here's something interesting I found. The equation that I provided on the wiki, aka the real bungee equation for partial bungee cords, is very very linear. Before, I figured out the physics equations for this event, I tried to simply gather data and see if it followed a linear, or quadratic, e...
by joiemoie
February 20th, 2015, 7:14 pm
Forum: 2015 Build Events
Topic: Bungee Drop C
Replies: 88
Views: 15231

Re: Bungee Drop C

This is my method for bungee: I don't know how math-oriented you all are but this is the method our team used to beat a Solon team last year at Regionals. You only need about 20 trials or so; the more the better. Take whatever cord you have and conduct separate trials on different lengths and masse...

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