普通高中新课标教科书(人教版)《物理(必修二)》第24页有这样一段话:“运动轨迹既不是直线也不是圆周的曲线运动,可以称为一般的曲线运动。尽管这时曲线各个位置的弯曲程度不一样,但在研究时,可以把这条曲线分割为许多很短的小段,质点在每小段的运动都可以看做圆周运动的一部分。这样,在分析质点经过曲线上某位置的运动时,就可以采用圆周运动的分析方法来处理了。” Textbook of the New Senior High School New Curriculum (PEP) “Physics (compulsory two)” Page 24 has such a passage: “motion trajectory is neither a straight line nor a circular curve motion, can be called a general curve movement .Although this When curves are curved at different positions, the curve can be segmented into many small segments during the study, and the particles can be viewed as part of the circular motion at every small segment of the curve. In this way, On a certain position of the movement, you can use circular motion analysis method to deal with. ”