以往进行《力与运动》单元教学的时候,我们总是将“力改变物体运动状态”这个概念停留在“让学生知道物体运动起来需要力”这一层面上,直到在一次教材培训时听到专家说了这样一句话:“让学生知道物体动起来需要力,更要让学生知道物体停止下来也需要力。”这段话明确地揭示了我们该 In the past, when teaching “Power and Movement” units, we always stuck the concept of “force changing the state of motion of the force” at the level of “letting the students know that the motion of the object needs strength” until a textbook During the training, I heard an expert say something like this: “It is necessary for students to know that they need to move, and to let them know that they need to stop.” "This passage clearly reveals that we should