一、动量守恒定律的条件性系统动量守恒是有条件的,其条件为一个系统不受外力或所受外力之和为零.例1如图1所示,装有细砂的容器恰能静止在斜面上,某物体以一定的速度相对于地面竖直落入容器内.与容器相碰后,容器与物体A.一定做匀加速运动B.一定做变加速运动C.一定做匀速运动D. First, the conditional conservation of the law of momentum The momentum conservation of the system is conditional, and the condition is that a system is free from external force or the sum of external forces received is zero. Example 1 As shown in Figure 1, a container with fine sand can just be stationary On the slope, an object falls vertically into the container at a certain speed relative to the ground. After colliding with the container, the container and the object A must be uniformly accelerated. B. Must be accelerated. C. Be sure to do uniform motion. .