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解力学问题通常有三种途径:用力的观点; 用能的观点;用动量的观点.一般地,有关时间的问题常用动量定理来解,有关位移(距离)的问题常用动能定理来解.但有时则需将这两个定理换位应用. 1.用动量定理求位移在电磁感应问题中,如果安培力是变力,则无法用求功的公式求出它所做的功,也就不能应用动能定理.这时可用动量定理和求电量的公式
There are usually three ways to solve mechanics problems: the forceful point of view, the energy use point of view, and the momentum point of view. Generally, the problem of time is often solved by the momentum theorem. The problem of displacement (distance) is usually solved by the kinetic energy theorem. But sometimes The two theorems need to be used in transposition. 1. Use the momentum theorem to find the displacement in the electromagnetic induction problem. If the Ampere force is a variable force, you cannot use the formula for finding the work to find the work done by it, and it cannot be applied. Kinetic energy theorem. The available momentum theorem and the equation for the quantity of electricity