从认知心理学的角度看,学生所要掌握的知识意义建构需要有精心的例题设计,学生的主体作用、教师的主导作用都需要由精美的例题设计来体现。所以说例题的示范性对中学物理教学有着至关重要的作用。正确发挥例题的示范性,能使学生的思维能力、解题能力得到很好的锻炼,从而从容的面对以后再物理学习中所遇到的各种物理问题。 From the cognitive psychology point of view, students need to master the construction of the meaning of the knowledge required careful case design, the main role of the student, the teacher's leading role needs to be exquisite example design to reflect. Therefore, the demonstration of the examples is of crucial importance to the teaching of physics in middle schools. Correctly exemplifying the examples, enabling students to thinking ability, problem solving ability to get a good exercise, so calmly face the physical problems encountered in the future physical study encountered.