This study developed a teaching material that makes the conservation of angular momentum, which students find very difficult, more concrete. The fact that angular momentum is a vector concept, the direction of the vector and the importance of this vector direction in angular momentum conservation are visualized. The teaching material consists of a table mounted on a freely rotating shaft, two electric motors mutually connected to the table, and a speed adjuster circuit used to change the rotation speeds of the motors. When electric motors begin to rotate, the angular momentum of the motors changes. How the angular momentum of the system is preserved thanks to the changing angular momentum of the parts interacting with each other, the directions of the vectors formed, the inertia torque, angular velocity, angular momentum relationship, and the relationship of the parts forming a system with each other have been tried to be explained in detail through the teaching material. When the motors were operated in different directions and speeds, the change in the rotation direction of the table was observed. This observation concretizes that angular momentum and angular momentum conservation are vector concepts. The right-hand rule, which describes the angular momentum vector direction with the material, can be demonstrated to students in practice. Video recordings showing how the teaching material works have been shared with readers.

中文翻译：

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指示角动量守恒的方向

这项研究开发了一套教材，使学生们觉得很难的角动量守恒变得更加具体。角动量是一个矢量概念，可以直观地看出矢量的方向以及该矢量方向在角动量守恒中的重要性。该教材由安装在自由旋转轴上的工作台、与工作台相互连接的两台电动机以及用于改变电动机转速的调速电路组成。当电动机开始旋转时，电动机的角动量发生变化。由于相互作用的部件的角动量的变化、形成的矢量的方向、惯性扭矩、角速度、角动量关系以及形成系统的部件的关系，系统的角动量如何得以保留彼此之间已尝试通过教材进行详细解释。当电机以不同方向和速度运行时，观察工作台旋转方向的变化。这一观察具体化了角动量和角动量守恒是矢量概念。右手定则描述了材料的角动量矢量方向，可以在实践中向学生演示。显示教材工作原理的视频已与读者分享。