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M=F·L 力對軸的矩是力對物體產生繞某一軸轉動作用的物理量.它是代數量,其大小等於力在垂直於該軸的平面上的分力同此分力作用線到該軸垂直距離的乘積;其正負號用以區別力矩的不同轉向,按右手螺旋定則確定:以右手四指沿分力方向,且掌心面向轉軸而握拳,大拇指方向與該軸正向一致時取正號,反之則取負號
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