一、记录测量结果测量结果三部分,准确、估计和单位。二、托盘天平的使用托盘天平要放平,游码复位再调衡。左盘放物右砝码,砝码要用镊子夹。三、重力地球吸物生重力,G与m成正比。作用点在重心,竖直向下莫忘记。四、力的图示分析物体受几力, First, record the results of the measurement results in three parts, accuracy, estimates and units. Second, the balance of the use of the tray balance scale, reset and then adjust the balance. Put the right weight on the left side of the tray and use the clips for the weight. Third, the gravity of the earth sucks gravity, and G is proportional to m. The point of action is at the center of gravity, forgetting straight down. Fourth, the force of the graphic analysis of objects subject to several forces,