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人教版高中物理教材必修2中是通过物体沿着光滑曲面滑下这个情景来推导出物体在A点的机械能和B点的机械相等。选择一个一般的光滑曲面而不选择圆弧或者抛物线,目的是让推导出来的结论更有普适性。教材通过同样可以证明在只有弹力做功的系统内机械能也守恒,最后得出机械能守恒定律。从课本上的推导到机械能守恒定律条件的深挖入,在衔接上笔者做了一点个人的思考;不到之处,请大家批评指正。情景:课本物体从光滑曲面下滑(如下图所示)
People's Education Edition High School Physics Compulsory 2 is through the object along the smooth surface sliding down this scene to derive the object at the A point of mechanical energy and B point of the mechanical equivalent. Choosing a general smooth surface instead of an arc or a parabola aims to make the derived conclusions more general. By the same textbook can prove mechanical energy in the system only elastic work is also conserved, and finally come to the law of conservation of mechanical energy. From the derivation of the textbook to the deep penetration of the conditions of conservation of mechanical energy, the author did a little personal reflection on the convergence. Wherever he went, please criticize and correct me. Scenario: Textbook objects slide down from a smooth surface (as shown below)