| 5-1 | 概述 Overview |
| 5-2 | 多粒子系統的質心 Center of Mass of Many-particle Systems |
| 5-3 | 質心的計算 Calculation of Center of Mass |
| 5-4-1 | 連續質量分佈 - 線質量與面質量密度 Continuous Mass Distribution –Linear and Surface Mass Density |
| 5-4-2 | 連續質量分佈 - 範例 Continuous Mass Distribution – Examples |
| 5-5 | 多粒子系統的動能 Kinetic Energy of Many-particle Systems |
| 5-6 | 多粒子系統的功、能原理 Principle of Work and Energy in Many-particle Systems |
| 5-7 | 質量會變化的系統 Variable Mass System |
