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用无弹性的绳子将两物体连接之后,当绳子处于拉紧状态时,两物体便处于牵连状态.处于牵连状态的两物体,一个物体的运动速度会随另一个物体运动速度的变化而变化.但由于其间有长度不变的绳子相连,所以,两物体的运动速度存在一定的数量关系.运用微元法,我们可以方便的确定两物体瞬时速度间的数量关系.例1如图1所示,用一根无弹性的绳子绕过定滑轮拉动水中的小船,若岸上的人以速度v匀速直线前进,求当连接船
After connecting the two objects with the inelastic rope, the two objects are implicated when the rope is in the tensioned state, and the two objects in the implicated state, the velocity of one object varies with the moving velocity of the other object. However, due to the length of the rope connected between the two objects, so there is a certain number of the relationship between the speed of movement using the element method, we can easily determine the instantaneous speed of the two objects between the number of relations. , With a non-elastic rope around the fixed pulley to pull the boat in the water, if the shore of people at a uniform velocity v straight ahead,