某時刻一質點位於O點，受到兩個力的作用，F1=3N方向東偏北450，F2=4N，方向西偏北300．請在下圖中做...

問題詳情：

某時刻一質點位於O點，受到兩個力的作用，F1=3N方向東偏北450， F2=4N，方向西偏北300．請在下圖中做出F1、F2的力的圖示並用作圖法求出這兩個力的合力F大小和方向．（要求標明標度，不必寫出求F的過程）

【回答】

作圖··············································································································· (2分)

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

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

知識點：力的合成和分解

題型：綜合題