On academic matters...
Our tensegrity labs for yesterday morning and yesterday afternoon (and tomorrow morning, too, I think) involved learning about force and stiffness. In lecture, Daniel and Dr. Oliveira taught us about Hooke's Law (Force=ks where k is the stiffness constant of the material and s is the amount of displacement under the force).
During the first test of the lab, we clamped strings of different materials to a square rod using a C-clamp and then added weight to the other end (bags of marbles). We used a yardstick to measure the resting length (before the weight was added) and the stretched length (after the weight was added).
In the second test of the lab, we clamped increasingly large amounts of marbles (10, 20, 30, etc.) to a tensegritoy string and measured resting and stretched length in each case. For both tests, we used these data to calculate change in length and then converted that to an amount in meters. Next, we converted the weight of the marbles to kilograms and found the force (mass x gravity). Last, we divided the force by the displacement to find the stiffness constants for the various materials. After we had done all of these calculations by hand, Daniel taught us how to do it in Excel. In today's afternoon Science Communication class, in fact, we did the same thing on our own. We created a chart for all of our measurements in the second test and used Excel to do the calculations. Afterward, we created a scatter plot of the data and then found a line of best fit. The slope of the line was the stiffness constant.
Well, that basically sums up yesterday's classes and today's afternoon class. I haven't been exposed to much of this type of subject before, but it was a pretty interesting topic.
We're going to go over the structure of our final project now... the end of COSMOS is almost here... =(
~CS
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