复杂运动的研究离不开运动的合成与分解,而牵连运动又是运动合成与分解问题中的难点问题,具有较强的综合性,既涉及矢量的合成分解法则,又涉及牛顿运动定律、能量、多体等内容,高考屡有考查,是命题的热点.一、“拉船”模型的建立与研究如图1所示,人用绳子通过定滑轮将水中的小船系住,并以速度v_0将绳子收短,此时绳与水面夹角为θ,求此时小船的速度. The study of complex movement can not be separated from the synthesis and decomposition of movement. However, implicated movement is a difficult problem in the synthesis and decomposition of movement. It has a strong comprehensiveness. It involves not only the law of synthetic decomposition of vectors, but also the Newtonian law of motion, energy , Multi-body and other content, college entrance examination often test, is the hot topic proposition. “Pull Boats ” model establishment and research shown in Figure 1, people rope through the fixed pulley will tie the water boat, and to Velocity v_0 rope closed short, this time the angle between the rope and the water θ, find the speed of the boat at this time.