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单摆问题不仅有丰富的内涵,而且应用情况复杂多变,既有力学知识的延伸、再现,又有力学规律的深化、综合,是重点,也是难点. 例1细长轻绳下端拴一小球构成单摆,在悬挂点正下方1/2摆长处有一个能挡住摆线的钉子A,如图1所示.现将单摆向左方拉开一个小角度, 然后无初速度释放,对于以后的运动, 下列说法正确的是( ). A.摆球往返运动一次的周期比无钉子时的周期小B.摆球在左、右两侧上升的最大
The pendulum problem not only has rich connotations, but also the application situation is complex and changeable. The extension and reproduction of the knowledge of mechanics and the deepening and integration of the laws of mechanics are key and difficult points. Example 1 The lower end of a slender light rope is smaller The ball constitutes a pendulum, and there is a nail A that can block the cycloid 1/2 just below the suspension point, as shown in Figure 1. Now the pendulum is pulled to the left by a small angle, and then it is released without initial velocity. For the following sports, the following statement is correct (). A. The cycle of a ball pendulum movement is smaller than the cycle without nails B. The maximum swing ball swings to the left and right sides.