Each group needs:

• a washer (affectionately called "Washy") with a weight of ~100 g*; such as a 1-1/8-inch USS flat washer (1-1/4-inch inner diameter, 2-3/4-inch outer diameter and 11/64-inch thickness); alternatively, use two ¾-inch USS flat washers (13/16-inch inner diameter, 2-inch inner diameter and 5/32-inch thickness); *washer weights may vary and the activity will still work
• 15 - 20 rubber bands
• 1 large piece of paper, such as chart paper, at least 54 inches (137 cm) long
• masking tape
• measuring tape, at least 5 feet (152 cm) long
• (optional) calculator
• (optional) bin or box to organize materials by group
• (optional) paper and pencil for taking notes
• Pre-Activity Quiz, one per student
• Activity Worksheet, one per student
• Post-Activity Quiz, one per student

To share with the entire class:

• scale, to measure the weight of the washers
• computer with Internet access and projector to show an online video and the Create a Safe Bungee Cord for Washy! Presentation, a PowerPoint® file