Each group needs:

• 6 rubber bands (a few different sizes)
• thin rope, 2.5 m
• string, .5 m
• scissors
• paper, 1 sheet
• Artificial Bicep Worksheet, one per student
• (optional) springs (may be expensive)

For the entire class to share:

• one 20-Newton spring scale ($3-4 at an educational supply store)
• ruler, 12-inch or meter