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Exploring the aerodynamic drag of a moving cyclist

机译：探索骑自行车的人的气动阻力

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Although the physics of cycling itself is a complex mixture of aerodynamics, physiology, mechanics, and heuristics, using cycling as a context for teaching physics has a tradition of certainly more than 30 years. Here, a possible feature is the discussion of the noticeable resistant forces such as aerodynamic drag and the associated power consumption of cycling. We use an energy-based approach to model the power input for driving a bike at a constant speed. This approach uses a numerical simulation of the slowing down of a bike moving without pedaling which is implementable with standard spreadsheet software. The simulation can be compared directly to simple measurements with real bikes as well as to an analytic solution of the underlying differential equation. It is possible to derive realistic values for the aerodynamic drag coefficient c_D and the total power consumption within a secondary physics course. We also report experiences from teaching such a course to class 8 students.
机译：尽管骑自行车的物理学本身是空气动力学，生理学，力学和启发法的复杂结合，但以骑自行车作为物理学教学的背景已经有30多年的历史了。在这里，一个可能的特征是讨论明显的阻力，例如空气阻力和相关的骑行功耗。我们使用基于能量的方法来模拟以恒定速度驱动自行车的动力输入。这种方法使用了可通过标准电子表格软件实现的不踩踏板的自行车减慢速度的数值模拟。可以将模拟直接与实际自行车的简单测量以及底层微分方程的解析解进行比较。可以在二次物理过程中得出空气阻力系数c_D和总功耗的实际值。我们还将向8年级学生报告从教授此类课程的经验。

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