胡克定律 F=-kx 表明,在弹性限度内,轻弹簧(理想弹簧)的形变具有可逆性,若以力 F 使弹簧伸长或缩短 x,当撤去 F 后弹簧将缩短或伸长同样的长度 x,并产生同样大小的弹力,而且与弹簧原来是否受力或者自由端是否连接物体无关.利用弹簧的这种特性,可以使许多问题直观化. 利用弹簧的 Hooke’s law F=-kx indicates that within the elastic limit, the deformation of the light spring (ideal spring) is reversible. If the spring is lengthened or shortened by force F, the spring will shorten or elongate when the F is removed. The length x, and produces the same size of elastic force, and has nothing to do with the original force of the spring or the free end is connected to the object. The use of this characteristic of the spring, can make many of the problems visible. Using spring