常见的弹簧是指质量不计的弹性体,它能发生明显的拉伸或压缩形变,它对物体(沿弹簧方向)能施以拉力,又能施以推力。弹簧中的弹力一般不能发生突变,这是因为弹簧的形变量较大,形变量的改变需要经历一定的时间,因此弹力的改变也需要一定的时间。1初例态1物体处于平衡状态质量均为m A common spring refers to an elastomer that does not have mass. It can undergo significant stretching or compression deformation. It can exert a pulling force on an object (in the direction of the spring) and can also exert a thrust. The spring force in the spring cannot generally mutate. This is because the deformation of the spring is large, and the change of the deformation variable needs to go through a certain period of time. Therefore, the change of the spring force needs a certain time. 1 Initial state 1 The object is in equilibrium and the mass is m