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两个运动杆件(或物体边缘)交点速度的分析题型经常出现于高中物理竞赛。这类问题有一定的趣味性,又有一定的难度。针对直杆情形证明了交点速度和杆上与交点相重合那个点的速度在各自杆的垂直方向投影相等~([1]),研究了曲线平动情形的最简求法~([2]),后来推广到了任意运动情形~([3])。针对常见的几种情形,还讨论了对应的解法~([4]),也强调了解析法的通用性~([5]),最近以直杆为例强调了微元法的重要性~([6])。
Analysis of two intersecting points of motion bars (or object edges) is often found in high school physics contests. Such issues have some fun, but also a certain degree of difficulty. It is proved that the velocity of the point of intersection and that of the point coinciding with the point of intersection are equal to the projection of the vertical direction of the respective rod ([1]), and the simplest method ~ ([2]) for the case of curve translation is studied. , Then extended to any exercise situation ~ ([3]). For several common cases, the corresponding solution ~ ([4]) is also discussed, and the generality of the analytical method is also emphasized. ([5]). Recently, the importance of the micro- ([6]).