Abstract: An educational tool for teaching principles of parametric resonance, linear force and angular momentum is presented herein. The tool includes a frame having a spindle assembly with a shaft. The upper end of the shaft is connected to an upper coupling and the lower end of the shaft is connected to a lower coupling. A turntable is positioned below the shaft and includes an offset mounting pin extending from a top surface thereof. Furthermore, a weight assembly is positioned through a hole in the shaft via an axle, wherein the axle is rotatable about a longitudinal axis of rotation within the axle hole of the shaft. The upper motor will rotate the shaft in one direction, while the lower motor rotates the turntable in a second, opposite direction causing the weight assembly to rotate and oscillate about the longitudinal axis with a varying moment of inertia.