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由于在讲述简谐运动时是以在水平方向振动的弹簧振子引入的,所以有的同学认为振动的物体在通过平衡位置时势能为零,这种观点是不准确的.其一,势能具有相对性,在某一位置势能的数值与零势能点的选取有关.其二,有些物体(如竖直方向的弹簧振子)即便规定平衡位置重力势能为零,但此时弹簧的弹性势能也不为零.所以确切的说法是在平衡位置时势能为最小.机械振动是
Because of the introduction of harmonic motion in the horizontal vibration of the spring oscillator is introduced, so some students think that the vibration of the object through the equilibrium position when the potential energy is zero, this view is not accurate.First, the potential energy has a relative The value of the potential energy in a certain position is related to the selection of the zero potential energy point.Secondly, some objects (such as the spring oscillator in the vertical direction) even though the gravitational potential energy at the equilibrium position is zero, but the elastic potential energy of the spring is not So, the exact answer is that the potential energy is the minimum when it is in equilibrium