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“‘杂术演员走钢丝’是哪类平衡?”新编高中《物理》(甲种本)讲平衡的种类时要学生回答这一问题。编者的意图很明显,要学生回答“是不稳定平衡”。然而爱钻课本的学生对这一答案是不会满意的。由于这是个“动态不稳定平衡”问题,对照一下课本上讲的道理,他们将会产生这样一些问题: “在重力和支持力作用下处于平衡的物体,在稍微偏离平衡位置之后……如果重心降低,平衡就是不稳定平衡;……”(课本207页)现在演员站在钢丝上,重心在支承面之上,稍一偏离,重心即降低,
“What kind of balance is the ‘manchurian actor walking on the tightrope’?” The new high school “Physics” (A type of book) asks students to answer this question when talking about the type of balance. The editor’s intention is obvious. Ask the student to answer “is an unstable balance.” However, students who love to drill textbooks will not be satisfied with this answer. Since this is a “dynamic instability balance” problem, and against the teaching of textbooks, they will have such questions as: “The objects that are in balance under the influence of gravity and support force, after deviating slightly from the equilibrium position ... If the center of gravity Lowering, balance is unstable and balanced; ”(“Textbook 207”) Now the actor is standing on the wire, the center of gravity is above the bearing surface, slightly deviated, and the center of gravity is lowered.