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力矩平衡的時候,力不一定平衡,因為力矩是力與力臂(距離)的乘積,力矩大小相等,不代表兩個力一定大小相等. 力系平衡必須滿足如下條件:將所有力向量都移到同一個起點的時候,各力的向量和為零.力矩平衡時的各力不一定滿足這個條件.
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