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一、理解与辨析1、弹力的有无与方向判断(1)弹力的产生条件:接触、形变.接触是条件,形变是本质.有弹力一定有接触,有接触并不一定有弹力.(2)判断弹力有无的常用方法——假设推理:假设两个相互接触的物体之间存在弹力,再根据平衡条件或牛顿定律推理,然后与题设条件进行比较,进而作出肯定或否定的判断.
First, understand and distinguish 1, the presence and absence of elastic force and direction to determine (1) elasticity of the conditions: contact, deformation. Contact is the condition, deformation is the essence. There must be contact with elasticity, contact does not necessarily have elasticity. (2 ) A common method for determining the presence or absence of an elastic force – Hypothetical Reasoning: Assume that there is elasticity between two objects that are in contact with each other, and then reasoning based on the equilibrium conditions or Newton’s law, and then compare them with the conditions of the question, and then make a positive or negative judgment.