The purpose of this experiment was to see which type of bridge is the strongest out of three types of bridges.
I became interested in this idea when I realized the increasing amount of traffic adds more weight on the bridges thus making them more likely to break.
The information gained from this experiment will help civil engineers to create stronger bridges for the increasing population.
My hypothesis is that the Truss Bridge will support the most weight.
I base my hypothesis on the information I learned that tells me that truss and arch are two of the strongest types of bridges.
The constants in this study were:
v The weights
The manipulated variable was the type of bridge.
The responding variable was the flex the bridge undergoes
To measure the responding variable I will use a micrometer.
1.Construct a stand for the bridges using Lego’s.
2.Construct a spanning bridge, made of Popsicle sticks, half a meter long using hot glue to fasten. (Looks somewhat like a railroad track up side down)
3.Construct a truss bridge, it looks like triangles between the two platforms, the platform is underneath the triangles.
4.Construct an arch bridge, looks like a platform with an arch above it
5.Place a.45kg-4.50kg (10 weights) weight on the span bridge.
6.Measure the amount it flexes using a micrometer.
8.Switch bridges to the truss bridge
9.Pace weights on new bridge
10.Measure flex using a micrometer.
12.Place weights on the arch bridge
13.Measure the flex using a micrometer
15.put data into graph
The original purpose of this experiment was to see which bridge would flex the most under load.
The results of the experiment were the truss bridge was the strongest and the arch was second. Span was weakest and flexed the least.
My hypothesis was that the truss bridge would flex the least because of its known strength
The results indicate that this hypothesis should be accepted the truss bridge I built flexed the least.
Because of the results of this experiment, I wonder if bridges using cables would hold more than no cable bridges.
If I were to conduct this project again I would use other types of bridges so I could test all the types of bridges and maybe create a bridge to test.
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