某时刻一质点位于O点，受到两个力的作用，F1=3N方向东偏北450，F2=4N，方向西偏北300．请在下图中做...

问题详情：

某时刻一质点位于O点，受到两个力的作用，F1=3N方向东偏北450， F2=4N，方向西偏北300．请在下图中做出F1、F2的力的图示并用作图法求出这两个力的合力F大小和方向．（要求标明标度，不必写出求F的过程）

【回答】

作图··············································································································· (2分)

F=4.3N(4.1～4.5均可)···················································································· (2分)

西偏北720(700～740均可)··············································································· (2分)

知识点：力的合成和分解

题型：综合题