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一.“拉船运动”的一般求解如图1所示,拉船运动是一种比较特殊的运动合成。原因在于这是一种带转动的运动合成,在中学非常少见。在通常的分析中一般是把船的运动V看成是:绳子的收缩运动V_1和垂直绳子方向的转动V_2的合运动。然后得到:V_1=Vcosθ,V_=Vsinθ①然后以①式来解决问题。然而最让人苦恼的是这个运动的合成非常难以理解,而且得出的合运动与分运动的关系式①也觉得比较飘忽,不扎实。
One. “Pull boat movement ” general solution As shown in Figure 1, pull the boat movement is a relatively special movement synthesis. The reason is that this is a combination of kinematics with rotation, very rare in secondary schools. In the usual analysis, the motion V of the ship is generally regarded as the combined motion of the contraction motion V_1 of the rope and the rotation V_2 of the vertical direction of the rope. Then we get: V_1 = Vcosθ, V_ = Vsinθ① Then solve the problem by ①. However, the most troubling thing is that the synthesis of this movement is very difficult to understand. Moreover, the relationship between the combined movement and sub-movement (1) is also rather erratic and not solid.