力對(duì)點(diǎn)的矩與力對(duì)通過該點(diǎn)的軸的矩的關(guān)系
由上面分析可知:[MO(F)]x= Mx(F),[MO(F)]y= My(F),[MO(F)]z= Mz(F)
力對(duì)點(diǎn)的矩矢在通過該點(diǎn)的某軸上的投影,等于力對(duì)該軸的矩。
力對(duì)O點(diǎn)之矩的大小和方向余弦為:|MO(F)|= cos(MO,i)= Mx(F)/|MO(F)|,cos(MO,j)= My(F)/|MO(F)|,cos(MO,k)= Mz(F)/|MO(F)|
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