Each group needs:

• 2 helical springs with different stiffnesses
• 2 different masses
• stopwatch
• Frequency and Period Experiment Worksheet, one per student

To share with the entire class:

• computer/projector to show students a 1:17-minute video on the Internet
• computer/projector to show students the Frequency and Period Presentation (PowerPoint)
• 2 AAA batteries
• Styrofoam, solid chunk to use as a base (see Figure 1)
• 2 balsa wood sticks (6.35 mm x 3.175 mm size), 25 cm and 35 cm long
• masking tape