物体仅在重力场中的运动是最常见、最基本的运动,但在解答质量不可忽略的带电物体在匀强电场中运动、能量问题时,我们常采用的方法是:把物体的运动分解成沿重力和电场力方向的两个分运动,同时研究这两种场对物体运动的影响,然后根据要求解答有关问题。用该种方法处理一些电场问题时,显得繁琐。此时,若能将重力场与电场合二为一,用一个全新的“复合场”(可形象称之为“等效重力场”)代替,就会显得 Objects in the gravitational field of motion is the most common and basic movement, but in the solution to the quality of non-negligible charged objects in uniform electric field motion, energy problems, we often adopt the method is: the object’s movement into Along the direction of gravity and electric field force two sub-movement, at the same time study the impact of these two fields on the movement of objects, and then asked to answer the relevant questions. In this way to deal with some electric field problems, it is cumbersome. At this point, if we can combine the gravitational field with the electric field and replace it with a completely new “composite field” (figuratively called “equivalent gravitational field”),