小船过河的运动可以看做是两个运动的合成:水流运动和船在静水中的运动。用Flash动画演示,对小船过河运动的分析、小船过河的时间、小船过河的最短位移的过程。当发v_水、v_船船为已知时,设置计算α、θ角的按钮和计算程序,演示形象、直观,易于分析与理解。 The movement of a boat across the river can be seen as a synthesis of two movements: the flow of water and the movement of the boat in the still water. Flash animation demonstration, analysis of the boat crossing the river movement, the time of the boat crossing the river, the process of the shortest displacement of the boat crossing the river. When the v_ water, v_ ship is known, set the calculation of α, θ angle buttons and calculation procedures, demonstration of the image, intuitive, easy to analyze and understand.