利用图像法，根据功能关系推导弹簧弹性势能表达式。得出在选择不同位置为势能零点时，弹性势能表达式不同，澄清学生对弹性势能大小及正负认识上的误区。%Through the graphic method,the formula of elastic potential energy of spring can be deduced based on the relationship between work and energy. It turns out that this formula changes as the zero point of potential energy changes. This can clarifies the students′ misconception about the magnitude and negative of elastic potential energy.
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