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二力平衡的知识是初中物理力学部分的重要知识点.二力平衡知识掌握得好坏,将直接反映同学们的力学学习水平,并影响今后对力学知识的领悟.理解二力平衡的条件二力平衡的条件是:两个力大小相等、方向相反、作用在一条直线上、作用在同一个物体上,即同体、等值、反向、共线.如果两个力符合这四个条件,这两个力就是一对平衡力.二力平衡条件表明,一对大小相等、方向相反的力平衡时,该二力必为作用于同一物体上的一对共点力.例1如图1所示的四种情形中,属于二力平衡
The balance of knowledge between the two forces is an important part of junior high school physics mechanics knowledge balance of the two forces to master good or bad knowledge will directly reflect the students’ level of mechanical learning and affect future knowledge of mechanical knowledge. Force balance of conditions are: the two forces equal size, the opposite direction, the role of a straight line, the role of the same object, that is, body, equivalent, reverse, collinear.If the two forces meet these four conditions, These two forces are a pair of balances.The balance of the two forces shows that when a pair of equal and opposite forces balance, the two forces must be a pair of common forces acting on the same object.Example 1 As shown in Figure 1 In the four cases shown, this is a two-force balance