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小车在底板上运动时 ,底板同时反向运动来验证动量守恒定律 ,是中学物理的一个经典实验。这个实验的演示历来有二个难点 :1.底板反向运动时 ,受到的阻力较大 ,导致底板启动难 ,反向运动现象不明显。2 .小车启动、停止一般直接用手参与操作 ,破坏了水平方向上动量守恒成立的条件
When the car moves on the floor, the floor moves in the opposite direction at the same time to verify the law of conservation of momentum. It is a classical experiment in middle school physics. Demonstration of this experiment has always had two difficulties: 1. When the floor moves in the opposite direction, the resistance is relatively large, resulting in difficulty in starting the floorboard and the phenomenon of reverse movement is not obvious. 2. The start-up and stop of a small car is generally directly involved in the operation by hand, and destroys the conditions for the establishment of conservation of momentum in the horizontal direction.