Materials List: Sum It Up:
An Introduction to Static Equilibrium

Each group needs:

  • Popsicle sticks, ~150
  • hot glue gun and glue sticks
  • foam-core board base, 6.5 x 6.5 inch (16.5 x 16.5 cm)
  • washers, coins or similar small objects (to use as weights)
  • small paper cup (to hold weights)
  • string (to hang cup from end of crane), ~1 ft (~30 cm)
  • Static Problems Worksheet, one per student
  • Competition Requirements
  • (optional) Survey, one per student

For the entire class to share:

  • textbook (or other weighty object) for the teacher torque demonstration described in the Introduction/Motivation section
  • a counterweight made from: a small paper cup; washers, coins or similar objects (to use as weights); and string (~1 ft or ~30 cm) (see instructions in Procedure section)
  • meter stick (to measure deflection of cranes at the end)
  • three-bar balance (or any balance or scale)
  • (optional) prize for winning team, such as lollipops or candy