三、运动物体长度收缩测量静止火车的长度,只要测出车头和车尾的坐标,然后相减即得,无须考虑测量的先后次序。测量运动火车的长度,如果先测车头位置后测车尾位置,由于列车在运行,会使测量结果变短;如果先测车尾后测车头,测量结果会变长。正确的方法应是车头车尾同时测量。为了区别于同地同时问题,把它称为异地同时。在经典物理中,异地同时和同地同时一 Third, the length of the moving object to measure the length of the static train, as long as the coordinates of the front and rear of the car measured, and then subtract them, without regard to the order of measurement. Measure the length of the moving train. If you measure the front position and then measure the rear position, the measurement result will become shorter because the train is running. If you measure the front end of the vehicle and measure the front end, the measurement result will become longer. The correct method should be to measure the front and rear at the same time. In order to distinguish from the same problem at the same time, it is called a different place at the same time. In classical physics, simultaneous and simultaneous