Each group needs:

• 2 stopwatches; borrow from other teachers or ask students to bring from home
• masking tape; not scotch tape
• 10 feet of string or fishing line
• heavy object or weight, to tie to string
• (if mass of heavy object is unknown) scale; one per class; groups can share
• calculator
• Swinging Pendulum Worksheet A (with algebra) or Swinging Pendulum Worksheet B (without algebra), one per student