有的物理习题,解答时看似缺少条件,其实一些条件隐含在习题的字里行间.找出这些隐含条件,是解题的关键. 比如,物体处于静止或匀速运动状态,说明物体必然受到平衡力的作用.物体在光滑的地面、桌面运动时,可不考虑摩擦力的作用.研究物体的运动时,一般把物体当作 Some physics exercises seem to lack conditions when answering. In fact, some conditions are implicit in the lines of the exercises. Finding these implied conditions is the key to solve the problem. For example, the object is in a state of static or uniform motion, indicating that the object must be balanced. The role of force. The object does not take into account the effect of friction when moving on a smooth floor or tabletop. When studying the movement of an object, it is generally treated as an object.