一支笔会掉到哪里去？
Where will a pen fall to?
摘要：
我们提出了一个简单的实验，每个人都可以在阅读本文时进行。我们只需要一支钢笔或铅笔和一根手指。与手指接触的下落笔的动力学基本上取决于笔的长轴的初始倾斜角度。我们指出了两种不同类型的轨迹的落笔，我们调查的初始条件，他们每个人都要实现。我们写的微分方程描述的动力学的笔，并分析它们的数值和分析。
英文摘要：
We propose a simple experiment that everybody can carry out just while reading this paper. The only thing we need is a pen or a pencil and a finger. The dynamics of the falling pen, which is in touch with the finger, depends essentially on the initial inclination angle of the long axis of the pen. We point out two different types of trajectories of the falling pen and we investigate initial conditions for each of them to be realized. We write differential equations describing the dynamics of the pen and analyze them both numerically and analytically.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
