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(2019•菏泽)阅读并计算:作用于同一点 的两个力的合成符合平行四边形定则(线段 的长 短表示力的大小,箭头方向表示力的方向),如图甲、乙所示,以表示 F 1 和 F 2 这两个力的线段为邻边作平行四边形,这两 个邻边之间的对角线就代表合力 F 的大小和 方向。请计算丙图中 F 1 和 F 2 合力的大小 N。
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