We investigate the interaction that occurs between a light solid cube falling under gravity and a horizontal soap film that is pinned to a circular ring. We observe in both experiments and quasi-static simulations that the final orientation of a cube that becomes entrapped by a soap film is strongly dependent on the Bond number. A cube is rotated by a soap film into one of three main orientations in a process that is driven by energy minimisation. The likelihood of observing each of these final orientations is shown to depend on the Bond number, and the most energetically favourable orientation depends on the terminal height reached by the cube. We also find a critical value for the Bond number, above which a cube is no longer supported by a soap film and detachment occurs, to be less than one.

中文翻译：

---

重力对吸附在皂膜或液体界面的立方颗粒的取向和分离的影响

我们研究了在重力作用下落下的轻质固体立方体与固定在圆环上的水平肥皂膜之间发生的相互作用。我们在实验和准静态模拟中观察到，被肥皂膜包裹的立方体的最终方向强烈依赖于邦德数。在一个由能量最​​小化驱动的过程中，一个立方体被肥皂膜旋转到三个主要方向之一。观察到这些最终方向中的每一个的可能性取决于键数，而最有利的方向取决于立方体达到的终端高度。我们还发现邦德数的临界值小于 1，在该临界值之上立方体不再由肥皂膜支撑并发生分离。