在体操运动中,所谓“晚旋”是指运动员在脱离器械(或地面)后,先只有绕身体横轴翻转,而没有绕身体纵轴的旋转,后来由于运动员做出一些相应动作,才产生了一种既有翻转又有旋转的复合转动。那么运动员在脱离器械后是怎样获得使身体绕纵轴旋转的力矩的呢?本文拟从力学原理上对这一问题进行探讨。一、力学原理我们知道,一个质点在非惯性参考系中,作相对于参考系的运动,它除受到一切实际的外力作用外,还要受到惯性力的作用。转动参考系也是非惯性参考系,在转动参考系中,运 In gymnastics, the so-called “late spin” refers to the athlete after leaving the device (or ground), only the first body around the horizontal axis flip, but not around the longitudinal axis of rotation, and later as the athletes to make some corresponding action, A combination of both turning and turning rotation. So how does the athlete get the moment that makes the body revolve around the longitudinal axis after getting rid of the instrument? This article intends to discuss this question from the mechanics principle. First, the mechanics We know that a particle in the non-inertial frame of reference, relative to the movement of the reference frame, in addition to being subject to all practical external force, but also by the inertia force. Rotating reference system is also a non-inertial reference system, in the rotating reference system, transport