论文部分内容阅读
原题某探究小组做“验证力的平行四边形定则”实验,将画有坐标轴(横轴为x轴,纵轴为y轴,最小刻度表示1 mm)的纸贴在水平桌面上,如图1所示。将橡皮筋的一端Q固定在y上的B点(位于图示部分之外),另一端P位于y轴上的A点时,橡皮筋处于原长。(1)用一只测力计将橡皮筋的P端沿y轴上的A点拉至坐标原点O,此时拉力F的大小可由测力计读出。测力计的示数如图2所示,F的大小为____N。
The original title of a research team to do “verification of parallelogram ” experiment, the paper will be drawn with the axis of the horizontal axis (x-axis, y-axis vertical axis, the smallest scale that 1 mm) on the horizontal desktop ,As shown in Figure 1. Fix one end Q of the elastic band to point B (outside the figure) on y, and point B on the y-axis at point A, the rubber band is at its original length. (1) Use a dynamometer to pull the P end of the rubber band to the coordinate origin O along the y-axis at point A, and the magnitude of the pulling force F can be read out by the dynamometer. The number of dynamometers is shown in Figure 2, and the size of F is ____N.