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初中物理教材中有多处容易混淆、容易出错的概念.学生往往区分不开或难以辨清,成为学习难点.进而形成不别要的困惑,动摇学习自信心.笔者就其中几处辨析如下.1重力(物重)与地球引力重力是由于地球的吸引而使物体受到的力(物体受到重力的大小通常称为物重).地球引力是地球对其表面物体的吸引力,它是万有引力的一分子.重力与地球引力相关,但并不等于地球对物体的引力.由于地球本身的自转,除了两极以外,地面上其它地点的物
There are many confusion in junior high school physics textbooks, easy to make mistakes in the concept of the students often can not distinguish or difficult to distinguish, become a learning difficulty, thus forming the indispensable confusion, shaken learning self-confidence. 1 Gravity (weight of matter) Gravity with the Earth Gravity is the force that an object is subjected to due to the attraction of the earth (the size of an object subject to gravity is often referred to as the weight of the object.) Gravity is the attraction of the Earth to its surface objects and it is gravitational One element. Gravity and gravity of the Earth, but not equal to the Earth’s gravity on the object. Due to the rotation of the Earth itself, in addition to the poles, the other places on the ground objects