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速度的合成与分解在运动学这一章是重点,高考也经常出现此类问题.其中小船渡河问题就是比较典型的题型之一,尤其是静水中船的速度小于流水的速度时船要最短距离渡河.而小船渡河问题正是检验同学对速度分解的理解和掌握程度.这类题型的难点在于对速度分解的深刻理解,几何作图能力.小船在流水中渡河时,同时参与两个运动:自身的划行运动和随水的漂流运动,其对应速度分别为:(1)小船划行速度,也称船在静水中速度,或称小船相对水的速度,其方向为船头指
The speed of synthesis and decomposition in the kinematics of this chapter is the focus of college entrance examination is also often such problems, of which the problem of crossing the river boat is one of the more typical questions, especially when the speed of hydrostatic ships less than the speed of the water when the ship to the shortest The distance crossing the river.The problem of boat crossing the river is to test the students’ understanding and mastery of the speed decomposition.The difficulty of these kinds of questions lies in the deep understanding of the speed decomposition and the geometric mapping ability.When the boat crosses the river in the flowing water, Movement: its own rowing exercise and drifting with the water movement, the corresponding speed were: (1) boat line speed, also known as the speed of the ship in the still water, or the speed of the boat relative to water, the direction of the bow for the finger