教学背景:本节内容是九年级物理第十二章《机械能和内能》第一节。在八年级物理学习中已经认识了动能、重力势能和弹性势能,学生能够简单判断物体具有哪种形式的机械能。学生在学习“功”的知识后,利用做功来进一步认识能量。但对于学生而言,能量的概念比较抽象,借助情景的创设让学生理解能量概念的生成过程,又适当地淡化了概念的严格体系,给学生以想象的空间和创造的空间,从而激发学生学习物理的兴趣和热情,体会物理学科之美。 Teaching background: This section is the ninth chapter physics twelfth chapter “mechanical energy and internal energy” the first section. In the eighth grade physical learning has kinetic energy, gravitational potential and elastic potential energy, students can easily determine the object has what kind of mechanical energy. After learning the knowledge of “power”, students use their power to further understand their energy. However, for students, the concept of energy is rather abstract. With the aid of scenarios, students can understand the process of generating energy concepts and appropriately dilute the strict system of concepts. Students are encouraged to learn by imagining and creating space. Physical interest and passion, experience the beauty of physics.