一、正确理解物体的平衡状态例1 以下四种情况中,物体处于平衡状态的有( ) (A)竖直上抛物体达最高点时(B)做匀速圆周运动的物体(C)单摆摆球通过平衡位置时(D)弹簧振子通过平衡位置时解析:所谓平衡状态是指保持静止或匀速直线运动的状态,即加速度a=0的状态.选项(A)是错误地认为静止就是速度为0;选项(B) First, the correct understanding of the object’s state of balance Example 1 In the following four cases, the object is in equilibrium with () (A) when the object is thrown up to the highest point in the vertical (B) a uniform circular motion of the object (C) pendulum When the pendulum ball passes the equilibrium position (D) When the spring oscillator passes through the equilibrium position, the equilibrium state refers to the state of maintaining the stationary or uniform linear motion, that is, the state where the acceleration a=0. The option (A) mistakenly regards the static state as the speed. 0; option (B)