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SpanStructure Kits

Design and build a bridge that spans between desks while learning the advantages of various bridge types!
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Budding engineers work together in small groups to learn how to identify and construct a beam, arch, and suspension bridge using the supplies in this bridge kit. Start lessons by positioning 2 chairs, desks, or tables 30" to 34" apart. Then, students can start building using a balsa wood set and steel plate. After creating the structures, they test the strength of each bridge by suspending beanbags from the structure. Through the process, students discover which style of bridge is best suited to span the distance between the two desks. More advanced lessons also show students how tension, compression, and force are dispersed across bridges and how it impacts their structural integrity. Included lesson direction is adaptable to Grades K-4 and 5-8 and details setup instructions, activities by grade level, learning objectives, and teaching suggestions to expand lessons. Kit accommodates 6 students. Set of 4 accommodates 24 students. Recommended for Elementary and up.

CHOKING HAZARD (1). Not for under 3 yrs.

Kit includes:

  • Balsa Wood Building Set, 1 Set
  • Steel Plate, 1 Ea
  • Glue, 1 Ea
  • Beanbags, Set of 4

Set of 4 includes:

  • Balsa Wood Building Sets, 4 Sets
  • Steel Plates, 4 Ea
  • Glue, 1 Ea
  • Beanbags, Set of 4

For an overview of the lesson direction, click here.

Next Generation Science Standards*:

  • 3-5-ETS1-1: Define a simple design problem reflecting a need or a want that includes specified criteria for success and constraints on materials, time, or cost.

  • 3-5-ETS1-2: Generate and compare multiple possible solutions to a problem based on how well each is likely to meet the criteria and constraints of the problem.

  • 3-5-ETS1-3: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved

  • 3-PS2-1: Plan and conduct an investigation to provide evidence of the effects of balanced and unbalanced forces on the motion of an object.

  • 3-PS2-2: Make observations and/or measurements of an object’s motion to provide evidence that a pattern can be used to predict future motion.

  • MS-ETS1-1: Define the criteria and constraints of a design problem with sufficient precision to ensure a successful solution, taking into account relevant scientific principles and potential impacts on people and the natural environment that may limit possible solutions.

  • MS-ETS1-2: Evaluate competing design solutions using a systematic process to determine how well they meet the criteria and constraints of the problem.

  • MS-ETS1-3: Analyze data from tests to determine similarities and differences among several design solutions to identify the best characteristics of each that can be combined into a new solution to better meet the criteria for success.

  • MS-PS2-2: Plan an investigation to provide evidence that the change in an object’s motion depends on the sum of the forces on the object and the mass of the object.

*The Next Generation Science Standards are a registered trademark of WestEd. Neither WestEd nor the lead states and partners that developed the Next Generation Science Standards were involved in the production of this product, and do not endorse it.