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A Bridge Made of Sticks?

 This is an Action Project for my core class Urban Planning. This unit has been all about bridges, equations, gravity, and Newton's Laws. This action project requires us to make a bridge out of popsicle sticks and glue. We are going to take the bridge and put 1 gallon of water on top of it to see if it will not break. This is an excellent idea because it shows gravity and its effect on objects. Newtons three laws are 1. An object will not change its motion unless acted on by an outside force. 2. F = M x A. 3. Every action has an equal and opposite reaction. With these bridges, we also need to calculate the Potential/Kinetic energies, angles, and lengths of each triangle in the bridge. Below is an image demonstrating the parts of my bridge that experience compression/tension, and all of the important pieces of the bridge. 

CJH/Bridge Visualisation/2021

Calculations:

How many sticks did you use?


At least 60 sticks.


How high will you bridge be when you put a gallon of water on it?


3 feet at least.


Choose one of the triangles of your bridge and measure all three sides.


Side 1: 6 inch

Side 2: 6 inch

Side 3: 8 inch


Law of Cosine: Angle 1


cos C = 6^2 + 6^2 - 8^2 / 2(6 x 6)

36 + 36 - 48 / 2 x 36 = 48.1897 degrees.


Law of Sine: Angle 2


sine 48.1897/6      sine B/6


289.1382 = sine B6


48.1897 = B


Subtract: Angle 3 (a triangle has a total of 180 degrees)


96.3794 - 180 = 83.6206


Potential energy:


.105 kg x 9.8 x 0.9144 = 3.087


Kinetic energy:

½ x m x v^2 = KE



Below you can see the finished product of my truss bridge with the gallon of water sitting on top along with my inspiration bridge. 

CJH/Bridge Holding Gallon/2021

Image result for warren truss bridge | Truss bridge, Warren truss, Bridge construction
Pinterest/Warren Bridge/2020

For my bridge design, it focuses on SDG 11 and the safety/sustainable portion of the SDG (Sustainable Development Goal). This was a very difficult project because of the amount of calculations and portions of this project I had to complete. The building of my bridge took at least a week because it kept falling apart and the glue wouldn't keep it up. I was able to overcome this by placing weights and putting it against a wall. Thankfully my bridge was able to hold a gallon of water without falling. If I could go back and redo a part of this project, I would try and remake the bridge now that I know how to make it sturdier and an easier way to make it. 

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