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初中物理第一册第二章安排了“二力的平衡”的教学内容。通过生活实例,可以得到结论“一个物体在两个力的作用下,如果保持静止状态,我们就说这两个力是平衡的”。再通过书中介绍的演示实验,仔细观察、分析,不难得出二力的平衡条件为“作用在一个物体上的两个力,如果在同一直线上,大小相等,方向相反,这两个力就平衡”。对初中学生来说,列举生动的实例,让学生动脑筋思考,再配合演示实验或让学生自己动手做实验,学生对一个新概念、新规律的认识,印象是较深刻的。在本节,认识静态的二力平衡,掌握二力平衡的条件是关
The second chapter of the first book of junior high school physics has arranged the teaching content of “the balance of the two forces.” Through life examples, one can conclude that “an object under the influence of two forces, if it remains static, we say that these two forces are balanced.” Then through the demonstration experiment introduced in the book, careful observation, analysis, it is not difficult to find the balance condition of the two forces is “two forces acting on an object, if in the same line, the same size, opposite direction, these two Balance on power.” For junior high school students, vivid examples are provided to allow students to use their brains to think, and then to cooperate with demonstration experiments or to let students do their own experiments. Students have a deeper impression of a new concept and new laws. In this section, understanding the static two-force balance and grasping the condition of the two-force balance is