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Which Bridge Design is Stronger?

Which Bridge Design is Stronger? | Science Fair Projects | STEM Projects
We're testing which bridge design is the strongest. We'll build three bridges and measure how much they flex when we put weights on them.


The hypothesis is that the Truss Bridge will support the most weight.

Method & Materials

You will construct a stand for the bridges using Legos, build three bridges out of Popsicle sticks, and measure the amount they flex using a micrometer.
You will need a box of 180mm Popsicle sticks, a micrometer, three bridges constructed of Popsicle sticks, a stand constructed of Legos, two 45kg weights, two .225kg weights, and one 1.25kg weight.


The results of the experiment showed that the truss bridge was the strongest and the arch was second. Span was weakest and flexed the least. This suggests that the hypothesis should be accepted.

Why do this project?

This science project is interesting because it helps civil engineers to create stronger bridges for the increasing population.

Also Consider

Variations to consider include testing bridges using cables to see if they hold more weight than no cable bridges, and testing other types of bridges.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

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