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《高中物理第一册(必修)》中有两个符号都是“g”的物理量。在第一章讲述重力时提出了关系式G=mg,g值取9.8牛/千克。这是重温初中物理知识,将初、高中物理知识衔接起来。在第二章讲述自由落体运动时,引出了重力加速度g,它通常取做9.8米/秒~2。同一本书出现两个都是g的物理量,它们究竟是同一个物理量的两种表述,还是有密切联系的两个不同物理量,课本未加具体说明。
Two symbols in “High School Physics Book One (Compulsory)” are physical quantities of “g”. In the first chapter on gravity, the relation G=mg was proposed, and the g value was 9.8 N/kg. This is to revisit junior high school physics knowledge and link the physics knowledge of the early and high schools. In the second chapter on the free-fall movement, the gravitational acceleration g is derived, which is usually taken as 9.8 m/sec~2. Two books in the same book appear to be physical quantities of g. Whether they are two expressions of the same physical quantity or two different physical quantities closely related to each other are not specified in textbooks.