Bridge Design Evaluation

This week for the inquiry we designed a truss bridge that has been reinforced. We have used triangles on our bridge. Our bridge deck spans 29 cm in length and is 6 cm wide. We choose a truss bridge because the triangles would make the bridge stronger. We have used 185 toothpicks. We also used extra toothpicks, to make our bridge stronger. We used PVA glue and a glue gun. It cost 5$ to use the glue gun. Altogether the cost was $138.80c. The deck worked really well but the sides were bending. The bridge holds up to 1200g of rice. We got 8/10 for the way our bridge looked. The truck also went through the bridge and made it across. Next time l think we could work on adding more triangles and more toothpicks under our bridge to make it more stronger. We could have double layered all of our toothpicks.  We used rice to see if our bridge will hold or break. Our group placed 3rd overall. We think that we did great overall with our bridge design.