Which Bridge Structure is The Best?

Which bridge Structure is The Best?

I am wondering which bridge structure is the best out of three bridge designs truss, span, and a rope bridge. My hypothesis is that out of the three the truss will because its stable and it has support on the top of the bridge. I chose this topic because I wanted to do this project last year so I am doing this project this year.

In my experiment I made three bridges and the three bridges are rope, truss, and a span bridge. I tested it by loading a bunch of marbles on it and seeing how many marbles will get it the most damaged. I also scaled it so they are all the same width and all the same length so it's accurate as possible. I weighed all the marbles so I know they are all five grams.I almost had two hundred marbles so it would be as accurate as possible.

Since each bridge has a different size, I needed to weigh each bridge. I then measured the ratio between the bridge’s weight and the amount of the weight that broke it. The truss bridge weighed 64 grams and broke at 4020 grams. The ratio was 64/4020 or 1.6 the span bridge had a ratio of 1.9 or 70/3680. The rope bridge had a ratio of 73/2640 or 2.7. Even though the truss bridge weighed the least it could hold the most weight.

This experiment was very fun I enjoyed all of it and it was amazing. Some problems I had were that it took a while to break and kind of tough to build the bridges because the rope bridge broke a lot.