12s is my homework in the first semester. The job is to ask us to make a device that can accurately measure 12 seconds. It was almost silly to start getting this topic, and I didn't know what to do. Because it was a group assignment, my teammates and I decided to paint some ideas first, and then exchange them in a concentrated way to select from them. We have drawn a lot of sketches, but the overall thinking is probably the same, using gravity. In the end we decided to use sand to make an hourglass-like device. Because it is better to control the sand than water to make a simple model. The time spent is longer than expected, but the final results are pretty good. A certain amount of sand is poured into the funnel, and then through the principle of gravity and leverage, the small bell above will ring in about 12 seconds. I thought that when I was reporting that day, everything was going well. I didn't expect my teammates to accidentally drop the model at home, and I was so anxious that I burst out. But fortunately he take the model before the end, and our model is also the most accurate time of the game. Relative to our model, I also found a lot of interesting.Something like useing air currents and useing thermal expansion and contraction. It's was very interseting.
Tong Pan, Zust China, Product Design, Hang Zhou