Each group needs:

• Bend That Bar Worksheets, one per person
• (optional) spring scale (or groups take turns if fewer are available)
• 1 bar 15"-18" (38-46 cm) in length and 1/8"-1/4" (3-6 mm) in diameter of each of the following: steel, aluminum and wood, and if possible, plastic, brass and copper; the metal rods and wooden dowel can be found at most hardware and hobby stores

• 1 Sharpie® or marker/pen to write on the bars
• yard/meter stick
• (optional) calculator
• bathroom or top-loading scale to weigh individual bars