Each group needs:

• Bridge Notes Worksheet, one per student
• 1 small sponge (or flat eraser)
• 1 dark ink pen or marker
• 1 strip of cardboard or poster board (1-in wide x 11-in long; 2.5-cm wide x 28-cm long)
• 1 10-foot (3-m) piece of string or small diameter rope
• 1 11-foot (3- or 4-m) piece of rope
• several textbooks (at least four)
• Bridge Types & Forces Worksheet, one per student