Building Bridges Again

The physics class is starting our second bridge project today. The bridge requirements are as follows:

• Minimum dimensions: 3 cm tall, 5 cm wide, 25 cm long
• Maximum weight (including all toothpicks and dry glue): 20 grams
• Height must be measured above the table level
• Weight must be able to rest on top of bridge

The students did some measuring and found the following information:

• Mass of 1 toothpick: 0.12 grams
• Length of 1 toothpick (point to point): 6.5 cm
• Avg. percent of weight from glue in 1st bridges: approx. 25%

They had to draw plans and make calculations showing how they would build the bridge within the parameters. Later today they will start the first phase of building.