Different+Structure's

**Hypothesis** My hypothesis is that the trussle will hold more weight because the triangles in the bridge will be the main structures. But if the bridge is flat then it will hold less weight and it will bend in words instead of holding a nice sturdy base.

**Broad Question** How much weight can differnt bridge strucure's hold

Specific Question
witch bridge is stronger trussle or flat?

Hypothesis
My hypothesis is that the trussle will hold more weight because the triangles in the bridge will be the main structures. But if the bridge is flat then it will hold less weight and it will bend in words instead of holding a nice sturdy base.

General Plan
my general plan is to test my two bridges muiltply time's before i get it right.

Potential Problems And Solutions
potential promblems i might have are not getting the excact same design as a real trussel and not being able to build it right.

Detailed Procedure
my procedure is first build my bridge then test it out with only 5 rocks then if it holds then add more rocks to it then if it doesnt then go back and and just try 5 rocks instead of 10

Photo List
the two bridge's and how many rock's i got on one bridge before breaking. how the design is

Time Line
time line 2/4-3/1-3/7-3/15-3/15-3-22/3/29

All Raw Data
test number 1 5 rocks test number 2 8 rocks test number 3 15 rocks ||  ||   ||   ||   ||
 * || flat bridge
 * || arched bridge ||  ||   ||   ||   ||
 * || test number 1 10 ||  ||   ||   ||   ||
 * || test number 2 18 ||  ||   ||   ||   ||
 * || test number 2 30 ||  ||   ||   ||   ||
 * || test number 2 30 ||  ||   ||   ||   ||

Results
My results are that the flat bridge held less rocks then the arched bridge because the flat bridge couldn't hold much weight and didn't have a good structure. For the flat-bridge I only got a low amount of rocks and for each tests they got higher. On the arched bridge i got a higher amount because the weight from the arch gave it more weight. Each time i would do the tests 3 times and each time it would get stronger. The flat bridge was harder because all it is just flat support with no weight on top, it was bending a lot more then the arched bridge. The weight changed a lot in this test because with flat bridge I could only get up two 15 rocks and the arched bridge I got up two 30 rocks before it caved in. also each time i made the bridges I made them a little stronger to see if it would make a huge difference or not.  **Conclusion**  **my conclusion is that the** **tussle** ** bridge will hold more weight because it has a better support and the flat bridge doesn't have much weight so when i did this experiment the trestle bridge had held more weight and rocks. **

Discussion
The meaning of my project is to see how much weight a bridge can actually hold before breaking. I wanted to test two different bridges a arched bridge and a flat bridge to see what one can hold the most weight. The way i set my graph up is so you can figure out how much weight the two bridges can hold with out me helping you. I also wanted to do my project on bridges because i was wondering how how long does it take to build a bridge how much weight can it hold and how long a bridge is. I did a mini bridge out Popsicle sticks and glue and it only took about 60 Popsicle. A mini flat bridge design can only hold up to 15 rocks and the arched bridge can hold 30 rocks before breaking.

Benefit to Community and/or Science
This could help people that want to be construction worker's or bridge builders. This can help people understand more about bridges and how safe/non they can be. I set my graph up to where they can just look at it and say oh that's how much weight a Popsicle bridge can hold before breaking.

Background Research
To build the tussle bridge i will only need about 60 Popsicle sticks for a perfect design of a real bridge. I will also need about 60 rocks total and a small thing of glue to successively complete my science fair. One of the websites that i had gone to was Google images.

Abstract
The whole reason why i did this experiment was to find what bridge could hold more weight. First i started out with designing how i was gonna build my project then I had to protected my hypothesis before i build my bridges i went on to the internet and found some really good information on a easy/proper way to build a bridge. The next step i did was build and tested my bridges three times use rocks as my test weight. I wrote down my data down for all three test and put it into a graph properly showing the right data that I had wrote down. My last couple of step to this project was writing my result witch all I wrote down was the results I got for the project and how I did the project. The discussion all I wrote down for was why I wanted to do this project for the science fair project and wanted i wanted to know about bridges and how many Popsicle sticks it would take to build a bridge. For the back ground research I wrote what I was gonna need for this project and how many Popsicle sticks I would need to build the bridges.