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不同的物理题型有不同的解法,但对同一问题,由于思考的角度不同,因而有不同的解法。巧妙、简捷的解法能提高解题速度和准确度。下面以’96高考物理题选解说明如下。 一、交替使用整体法和隔离法 例1(高考题20)。如图1,所示倔强系数为K_1的轻质弹簧两端分别与质量为m_1、m_2的物块1、2栓接,倔强系数为K_2的轻质弹簧上端与物块2栓接,下端压在桌面上(不栓接),整个系统处于平衡状态。现施力将物块1缓慢竖直上提,直到下面那根弹簧的下端刚脱离桌面。在此过程中,物块2的重力势能增加了
Different physical questions have different solutions, but for the same question, because of different perspectives, there are different solutions. Clever and simple solutions can increase the speed and accuracy of problem solving. The following explanation of the ’96 college entrance examination physics topics is as follows. First, use the holistic method and isolation method Example 1 (examination for college entrance examination 20). As shown in FIG. 1 , the two light weight springs with a stub coefficient of K_1 are bolted to masses 1 and 2 of mass m_1 and m_2, respectively. The upper end of the lightweight spring with a stub coefficient K_2 is bolted to the mass 2, and the lower end pressure is shown. On the desktop (without bolting), the entire system is in equilibrium. The force is now applied to slowly and vertically lift the block 1 until the lower end of the lower spring just leaves the table. In this process, the gravitational potential energy of block 2 increases