质心
质心（英语：center of mass）是多质点系统个质量中心。如果对箇点施加一個力，系统会得沿力个方向运动、弗会得转。质点位置对质量加权求平均就好算出质心个位置。
除脱均匀重力场个情况，同一物质系统个质心搭仔重心通常弗勒拉同一個假想点上。
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