Principle of action and reaction: when an object A exerts an action force on an object B, the object B must also exert a   reaction force on the object A. The force of action and reaction are equal and opposite, acting on the same line. According to the prototype model of air  reaction force, the electric wind car can  run farther and faster. Because it uses air reaction force to provide energy and the frame of the vehicle is light. When the power is switched on, the battery provides electricity to the motor. And the motor rotates and drives the fan blade to rotate, blowing the wind backwards. The reaction force of the wind makes the car move forward. *See ADDITIONAL RESOURCES above to access our Teachers Resource guide pertaining to this kit.