Have your class make a molecule mobile to align with NGSS Matter and Its Interactions MS-PS1-1, Develop models to describe the atomic composition of simple molecules and extended structures. In addition, this resource could also be used to cover standard MS‑PS2, Motion and Stability: Forces and Interactions to model equal forces, torque, center of mass, or stable equilibrium and/or MS‑PS3, Energy, to model potential/kinetic energy. In addition, it reaches across curriculums to include engineeri