初中物理课本中 ,实验题型的“练习”所叙述的物理现象 ,通过实验解答和说明 ,可收到满意的教学效果 .但有的教师怕麻烦 ,常以“讲”代“做”地提示或讲解答题要点 ,影响了教学效果 .为此 ,我们设法将“练习”中的叙述性实验改为实验活动 ,增加学生进行实验探索的机会 ,降低他? In the junior high school physics textbook, the physical phenomena described in the “Exercise” of the experimental question type can receive satisfactory teaching results through experimental answers and explanations. However, some teachers are afraid of trouble and often use the “speak” and “do” tips. Or to answer questions, affecting the teaching effect. To this end, we have tried to change the narrative experiment in “Exercise” to an experimental activity to increase students’ opportunities for experimental exploration and reduce him?