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在一些中学物理习题参考书中常有类似以下的问答题或选择题: 一根密度均匀,截面为圆形,由粗逐渐变细的长棒,如果通过重心沿轴线的垂直方向将它截为二段,问哪段重? 对这题的回答,往往不要求定量计算,因此一般是作这样分析:假定棒的A端底面大于B端(见图1),质量分布趋向粗的一端,整个棒的重心就不在轴线中点,
In some secondary school physics problem reference books, there are often quiz questions or multiple choice questions similar to the following: A uniform density, circular cross-section, a thick bar that gradually tapers, if it is cut to two in the vertical direction along the axis through the center of gravity The answer to this question often does not require quantitative calculations, so it is generally analyzed as follows: Assume that the bottom end of the rod A is larger than the B end (see Figure 1), and the mass distribution tends to be thicker, the entire rod The center of gravity is not at the midpoint of the axis.