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在高中物理中,我们研究地面上物体的运动时,一般选择地面做参考系,用地面做参考系易于理解和接受,一般也能有效地解决问题,但有时变换一下参考系,不以地面为参考系,会使解决问题变得简单方便.例1.如图1所示,甲、乙两物体做同方向、同一直线的匀速直线运动,甲物体在后速度为v_1=10m/s,乙物体在前速度为v_2=4m/s,开始时两物相距300m,问多长时间甲追上乙?
In high school physics, when we study the movement of objects on the ground, we usually choose the ground as the reference frame, and the ground reference system is easy to understand and accept. In general, we can solve the problem effectively, but sometimes we change the reference frame, Reference frame, will make the solution to the problem becomes simple and convenient .Example 1.As shown in Figure 1, A and B two objects in the same direction, the same straight line uniform linear motion, A object in the rear speed v_1 = 10m / s, B Objects in the former speed v_2 = 4m / s, the beginning of the two objects apart from 300m, ask how long a catch up with B?