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高中《物理》第一册第三章有一个演示实验《研究牛顿第二定律》，这个实验是得出牛顿第二定律的基础，但在实验中由于多方面因素的影响（尤其是系统误差），使得通过实验很难得出结论。分析其原因主要有：①小车与桌面间的摩擦力比较大与拉力相比不能忽略；②实际实验中砝码质
There is a demonstration experiment “Study on the Newton’s Second Law” in the third chapter of “Physics” Volume 1 of High School. This experiment is the basis for the Newton’s second law, but due to various factors (especially systematic errors) in the experiment. , making it difficult to draw conclusions through experiments. The main reasons for the analysis are as follows: 1 The friction between the car and the desktop is relatively large compared with the pull force; 2 The actual weight in the experiment