高中物理“单摆”的考查重点是单摆周期的计算 ,其中尤以在匀变速运动系统中的单摆周期的计算为难点。传统方法是求出单摆的等效重力加速度ｇ′ ,代入周期公式Ｔ =2π ｌ/ｇ′ 即可。而等效重力加速度 ｇ′的求法是 :先确定单摆在系统中的平衡位置 ,然后求出平衡位置时摆线对摆 High school physics “pendulum” examining the focus is the calculation of single pendulum cycle, especially in the uniform speed motion system pendulum cycle calculation as the difficulty. The traditional method is to find the pendulum equivalent gravitational acceleration g ’, into the periodic formula T = 2π l / g’ can be. The equivalent of the acceleration of gravity g ’method is: first determine the pendulum in the system of equilibrium position, and then find the equilibrium position when the cycloid pendulum