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[函数] 数学方法证明合力大小

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reny Posted 2013-10-20 14:10 |Read mode
已知力$F_1,F_2$的夹角$\theta\in(\dfrac{\pi}{2},\pi)$,固定$\theta$,试用数学方法解释,当$F_1,F_2$变大时,合力怎么变化?

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kuing Posted 2013-10-20 14:19
$F=\sqrt{F_1^2+F_2^2+2F_1F_2\cos\theta}$ 吗?

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其妙 Posted 2013-10-20 16:55
他的意思是不仅仅关注合力大小的取值范围与变化过程,而且还要关注合力的方向?
妙不可言,不明其妙,不着一字,各释其妙!

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kuing Posted 2013-10-20 17:32
呃,总之……画个平行四边形出来就好了吧

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