速度分解是高中物理中的一类典型问题,是高考和竞赛的重点和热点,但却是学生学习的难点.通过用常规方法解决几个典型例题发现其局限性,继而利用位移法对这些例题进行分析思考,理出速度分解的实质及其准则,希望对高中学生在速度分解问题的学习和理解方面有所帮助. Speed ​​decomposition is a typical problem in high school physics, which is the focus and hot spot of college entrance examination and competition, but it is also a difficult point for students to learn.Through the conventional method to solve several typical examples to find their limitations, and then use the displacement method for these cases Analyze and think out the essence of speed decomposition and its guidelines, hoping to help speed learning and understanding of high school students.