力的平衡是初中物理的重点知识之一,贯穿整个力学的学习,也是中考命题的热点,二力平衡的条件是学习重点;判断物体受到的力是否为平衡力是难点。一、考查平衡力的概念一个物体在几个力的作用下,总保持静止或匀速直线运动,这几个力就是平衡力。考查题型一般是选择题或填空题,当物体不受力或受平衡力时的作用时,物体会保持静止或匀速直线运动状态,当物体受到 The balance of power is one of the key knowledge of physics in junior middle school. Throughout the study of mechanics, it is also a hot topic in the middle school entrance examination. The condition of balance of two forces is the key point of study. It is difficult to judge whether the force received by the object is balance. First, examine the concept of balance The role of an object in a few forces, always remain at rest or uniform linear motion, these forces are balance. Test questions are generally multiple choice or fill in the blank question, when the object is not force or the role of balance, the object will remain stationary or uniform linear motion, when the object is