Bridges Part 2

Please see my first post,  Bridges Part 1, to see how we got started.

As I was leaving and packing up my bags the week I was introducing types of bridges,  I looked out at the construction going on and I spotted trusses.  We were so fortunate to go on a mini field trip the next day.  I was even given the blueprints of the trusses used to build our new snack shack and restrooms.

There are many great books, images and videos on the Internet.  We learned about the main types of bridges and parts.

Now to the design challenge.  My engineers had to build a bridge using exactly 50 Popsicle sticks(all cut pieces) that allows a car to pass and holds weight.  It had to have a minimum six inch.  Here are a few sketches:

This tool is amazing.  It cuts through Popsicle sticks and allows you to make angles.  I had my students wear eye goggles and supervised them while using.  They are sharp and pieces fly.

Link

When gluing, use wax paper on top of cardboard or foam board.  Use a craft glue, I bought the new Elmer's Glue All and small refillable bottles.  I did not use the hot glue gun until the last day for any emergency repairs.  We worked in stages and spent three days building.

 A little overkill with the glue!!!!

I planned extra activities for students who were done gluing and waiting for things to dry.  There was a bridge sort, research bridge projects and making Lego bridges. 

Testing day was so much fun.  My students gathered around my big table and we tested each bridge for a car to travel on and that the bridge could hold weight.  There were a few groups whose bridge did not meet the size criteria.

Our bridge display