Hall's Friction Cars, 2-Pack Glass Bottles_BOD Bottles Hand-driven Newton's color disc that

Hand-driven Newton's color disc that spins seven painted segments fast enough to merge into apparent white through persistence-of-vision and additive color mixing

paired with a 13 mm curved enamel-coated steel blade for portable benchtop and laboratory measurement tasks

sized one inch wide and a quarter inch thick for durable measurement work in physics classrooms

with thermometer tubulure and glass manometer for calibrating thermometer upper fixed points under steam

Hall's Friction Cars, 2-Pack Glass Bottles_BOD Bottles Hand-driven Newton's color disc thatSold as a matched pair for collision and comparison work, these low friction Hall's cars support kinematics, energy, and friction experiments on inclined planes and tracks.