Balsa Bridge

Read the Kelvin Bridge Book provided by Mrs. Pennington and write a 200+ word response on bridges and using balsa.  

Use balsa and the glue provided by Mrs. Pennington to create a bridge with the following guidelines:

• It must span a gap of 24 centimeters.

• It must be made only of balsa strips 1/8 by 1/8  except for one piece of wide balsa for the roadway.

• It must be created with only wood/tacky glue and balsa.

• It must not be longer than 36 centimeters.

• One or two small rods must pass the width of the bridge for the testing, so you must leave space for this.

• The bridge must support 35 pounds for 1 minute.

• Total bridge weight has to be 60 grams or less.