高中多见一类以物系相对运动为背景的物理问题,此类问题都会涉及到运动学、动力学、能量、动量等诸多内容.我们可以分别建立两种模型.即“无动力”提供的“子弹打木块”模型和“有动力”提供的“人船”模型.模型一如图1所示,一木块放在光滑水平面 High school to see a class of physical relative motion to the background of the physical problems, such issues will involve the kinematics, dynamics, energy, momentum and many other content.We can establish two models, namely Supplied “Bullet Fight Wood ” model and “Powered ” provided “Ship ” model.A model as shown in Figure 1, a piece of wood on a smooth water level