POE和PBL教学策略下的物理实验探究——以楞次定律为例

Exploration on Physical Experiments under POE and PBL Teaching Strategies

很多教师在“探究影响感应电流方向的因素”实验中对于如何有效引导学生提出感应电流磁场这一概念,归纳形成简洁的、具有普遍意义的结论心存疑惑.在POE教学策略和PBL问题导向下,从物理规律出发,巧妙改进教材中实验情境,利用力学知识,深度分析楞次定律的内涵本质.

“Senior High School Physics Curriculum Standards(2017 Edition)”clearly set forth teaching requirements for Lenz′s Law,emphasizing the necessity to conduct experiments such as“investigating the factors affecting the direction of the induced current”.Students are expected to obtain reliable experimental phenomena,analyze to discover experimental rules,and then generalize to form concise and universally valid conclusions.Many teachers are perplexed about how to effectively guide students towards the concept of the magnetic field of an induced current.This paper,under the teaching strategies of POE(Predict-Observe-Explain)and PBL(Problem-Based Learning),starts from the physical laws,cleverly improves the experimental situations in the textbook,and uses mechanical knowledge to deeply analyze the connotation and essence of Lenz′s Law.