About this item:
A basic, inexpensive Fan Cart powered by two AA-size batteries (not included) demonstrates Newton's principle of action and reaction. 
The batteries are contained in the removable power unit and the fan is controlled by a switch. The propeller delivers a thrust of about 88mN, accelerating the cart at 0.4 m/s2. A transparent plate can be attached to show the effect of reversing the airflow. Includes activity guide.