Fan Cart, 1 Each

The Fan Cart by United Scientific is a battery-powered cart that demonstrates Newton's principle of action and reaction. Its switch-controlled propeller delivers about 88 mN of thrust, accelerating the cart at about 0.4 m/s², and a transparent plate can be attached to show the effect of reversing the airflow. It runs on two AA batteries (not included) in a removable power unit and is used in introductory physics labs.