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Introduction |
Process Posted by Todd Pollock, 9/30/03 at 9:10:16 AM. The Process Step One: Watch the film, “Bridges”. Take plenty of notes during the film to help with the worksheet you have to complete. Step Two: Watch the film, “Build’em and Bust’em”. Step Three: Together we will discuss your booklet “Bridge Design and Construction”. Step Four: You will build four different beams (the I beam, T beam, L beam and box beam). The class will test the beams for strength and flexibility. Step Five: Using the information that you have learned, you will choose one of the three types of bridges and build a bridge out of balsa wood. The materials needed will be supplied by your instructor and include: wood glue, 12 feet 1/8” x 1/8” balsa wood, 36” of fishing line, X-Acto knife and a plan sheet. Bridge design specifications: 1. The bridge must span the 9” river and cover the 1” space on top of each bridge pier. Total length will be 11”. 2. The bridge must be a minimum of 3” wide with a maximum of 3 Π” wide. 3. The bridge silhouette can only be 1/8” thick. All joints and braces must be flat against the design sheet. 4. Wood cannot be laminated. 5. You will have to leave an open space directly in the middle of your bridge. It should be 2” wide and 3” long to allow room for the bridge breaking setup. Step Six: Bust’em! The instructor will assist the students in busting their bridges as a group. Students will go one at a time, recording the results of the maximum pressure supported by each bridge. Final Step: The students will write a one-page report telling how their bridge held up to the pressure. Include the things they would do different next time and if they enjoyed the project or not. |