在高中物理(人教版第一册必修)第七章“机械能”第六节“机械能守恒定律”中,有小球在摆动过程中机械能守恒演示实验。该实验只是定性演示,过程简单,单调,不会引起学生重视,学生不易进一步理解和掌握机械能守恒这一规律。在教学实践中,笔者觉 In high school physics (PEP 1), Chapter 7 “Mechanical Energy ” Section 6 “Conservation of Mechanical Energy ”, there is a demonstration experiment of the conservation of mechanical energy during the swing of the ball. The experiment is only a qualitative demonstration. The process is simple and monotonous. It does not cause students to attach importance to it. Students cannot easily understand and master the law of conservation of mechanical energy. In teaching practice, I feel