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在高中物理第一册（必修）课本中，“牛顿运动定律”一章的“牛顿第二定律”是这一单元的重点知识，做好牛顿第二定律的演示实验非常重要．实验装置看似简单，但要做得成功还有一定的难度，要用人工控制两个小车同时停止运动，确实不易，稍有不慎，小车就会冲出长木板撞向定滑
In the first volume (required) textbook for high school physics, “Newton’s second law” in “Newton’s laws of motion” is the key knowledge of this unit. It is very important to do a demonstration experiment of Newton’s second law. The experimental device may seem simple, but there are certain difficulties in achieving success. It is not easy to manually control the two cars to stop the exercise at the same time. It is not easy, and the car will rush out of the long board and crash into the sliding.