力 F 1 = 30 N,方向水平向右,力 F 2 = 30 N,方向竖直向上,求这两个力合力的大小和方向。 如果保持两分力的大小不变,改变两个力之间的夹角,将两个力之间的夹角改为 60度和120度,则合力分别是多大?根据上面的计算,在两个分力大小不变的情况下,改变两个分力的夹角,合力怎样变化?
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