现行初中物理中固体压强跟支承面之间的关系这一实验,是用一只小木桌压在沙上来演示的,当小木桌四条腿立在沙上时,小木桌下陷,当小木桌的桌面放在沙上时,小木桌不下陷。我们认为这实验演示时现象不明显,教学效果不理想。其一是,当小木桌四条腿立在沙上时,压在小木桌上的压力与 The experiment of the relationship between the solid pressure and the bearing surface in the current junior high school physics is demonstrated by using a small wooden table pressed against the sand. When the four wooden legs of a small wooden table stand on the sand, the small wooden table sinks, and the table of the small wooden table When placed on the sand, the wooden table does not sink. We believe that the phenomenon of this experiment was not obvious and the teaching effect was not satisfactory. One is that when the four wooden legs stand on the sand, the pressure on the wooden table