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09 - 9 9-1,2 = = 0 0(e.g CM(center of mass CM 1 2 1(1 2(1...

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9장. 입자계 9-1,2 질량중심 운동 = 위치가 시간에 따라 변하는 것     물체 크기 없는 입자( 질점) 무엇이 위치   인가 자명함 크기 있는 것 어느점이 물체의 위치? 물체의 운동 크기 = 0 입자[   ]의 운동 병진운동 크기 0, 무엇이   인가? 외부운동 대표점(e.g. CM)의 병진운동 회전운동 내부운동 변형 진동
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★질량중심( c enter of m ass, CM ) 1. 정의 ① 물체의 모든 질량이 그 곳에 모여 있고 ② 모든 바깥 힘이 그 곳에 작용하는 것처럼 보이는 점 2. 질량중심의 위치 1) 입자 두개로 된 물체의 질량중심       ( 1차원 이면)      2) ( 1차원 ): 입자 개가 한줄로 늘어선 물체의      ⋯      ⋯        총질량 3) (3차원): 입자 개가 퍼져 있는 물체의 질량중심      ,                 4) 물질이 연속분포된 물체의 질량중심: 덧셈( ) 적분( )         
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9-3 입자계의 운동에 관한 뉴턴의 제2 운동법칙 입자계의 질량중심  의 운동방정식          ⇓ ⇦     (많은 경우)        ≡ 
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