Per group:

• 2 LEGO motors
• 3 LEGO LED light bulbs
• LEGO base (~15 x 25 cm)
• a few flat LEGO pieces to connect motors to base (they need to be raised)
• 2 LEGO electrical connector wires
• 2 ~2-3 cm diameter washers
• ~1 m thin string or heavy thread
• meter stick
• Student Worksheets, one per student