一个物体或系统,若受到多力作用,若这些力的合力为零,对任一点之合力矩也为零,该物体或系统速度亦为零,则该物体或系统即称为静力平衡或静态平衡(Static equilibrium)。换句话说,若一物体处于静力平衡,则物体静止不动。[1][2]
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