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某些物理题已知物理量不多,但在解答过程中,牵涉的未知物理量比较多。解这类含多个未知物理量的问题,首先必须熟练地掌握所学的物理规律和公式,要求同一公式会用不同的物理量来表示;其次,能应用数学知识,根据物理规律来建立数学方程,要求在解题中牵涉到多少个未知物理量,就必须按照物理规律列出相应个数的独立方程;最后,把不需要求的中间未知量,全部用所求的未知量和已知量来表示,就能迎刃而解。
Some physical problems do not have much known physical quantity, but in the process of solving, there are more unknown physical quantities involved. To solve such problems with multiple unknown physical quantities, we must first master the learned physical laws and formulas, and require that the same formula be represented by different physical quantities. Second, we can apply mathematical knowledge and establish mathematical equations based on physical laws. To ask how many unknown physical quantities are involved in solving a problem, it is necessary to list the corresponding number of independent equations according to the laws of physics; finally, the intermediate unknowns that do not need to be found are all represented by the unknowns and known quantities that are sought. , can be solved.