初中阶段的物理概念和规律一般反映三、四个物理量之间的一次函数关系,而这些物理量之间又常存在着正比和反比的关系.训练学生运用比例法解题,不仅可使解题过程简单明了,还可使学生加深对物理公式及物理规律的理解和掌握. The physical concepts and laws of junior high school generally reflect the primary function relationship between three or four physical quantities, and there is often a direct and inverse relationship between these physical quantities. Training students to solve problems using proportional methods can not only make the process of solving problems Simple and clear, but also enable students to deepen the understanding and mastery of physical formulas and physical laws.