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一、弹簧弹力特点与解题基本思路根据胡克定律,弹簧的弹力 f 与弹簧的形变量 x成正比,因此在求解弹簧问题时要注意两点:①弹簧的弹力是变力;②弹簧弹力的变化随形变量的改变而改变,弹簧形变量的变化需要时间,弹簧弹力的变化也需要时间.例1.在水平地面上放一个竖直轻弹簧,弹簧上端与一个质量为m=2.0kg 的木块相连.若在木块上再作用一个竖直向下的力 F 使木块缓慢向下移动0.1m,力 F 作功2.5J,此时木块再次处于平衡,力 F的大小为50N,如图1所示.则木块下移0.1m 的过程中,弹性势能增加
First, the characteristics of spring elasticity and the basic idea of solving problems According to Hooke’s law, spring elastic force f is proportional to the deformation of the spring x, so when solving the spring problem should pay attention to two points: 1 spring elastic force is variable; 2 spring elastic force The change of the change with the change of the shape variable, the change of the spring-shaped variable takes time, the change of the spring force also takes time. Example 1. Put a vertical light spring on the level ground, the upper end of the spring and a mass of m = 2.0kg The wooden blocks are connected. If a vertical downward force F is applied to the block, the block moves slowly downward by 0.1m, the force F works 2.5J, and the block is again in balance, and the force F is 50N, as shown in Fig. 1. The elastic potential energy increases during the downward movement of the block of 0.1m.