Observation | 觀察
In an elastic collision, both momentum and kinetic energy are conserved. In an inelastic collision, kinetic energy is lost to the surroundings (e.g., as heat or sound), but total momentum remains conserved.
在彈性碰撞中，動量和動能均守恆。在非彈性碰撞中，部分動能會轉化為其他形式的能量（如熱能或聲能）而流失，但總動量依然守恆。