Each group needs:

• 1 straw or 12-inch ruler (straws if students will keep the quadrants)
• 1 piece of string (about 6 inches)
• 1 sheet of poster-board or stiff paper (such as two pieces of construction paper glued together)
• 1 small weight (such as a washer, metal nut or any small, heavy object)
• 1 protractor (if available; share with other groups if necessary)
• tape
• 1 pencil