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在初中物理学习中,不少同学对重力、压力、支持力认识不清,在分析相关物体的受力情况时常出现“增力”“漏力”的错误,要学好这些知识,同学们必须深刻理解和熟练掌握以下两方面内容:一、正确认识三种力的性质与区别重力的性质属于万有引力,它是两个物体相互吸引而产生的。地球表面的一切物体(与地球接触)和地球附近的一切物体(与地球不接触)都受到地球的吸引,因而他们都会受到重力的作用,施力者是地球,受力者是物体。重力的作用点
In junior high school physics study, many students do not know enough about gravity, pressure, and supportive force. When analyzing the stress situation of related objects, mistakes such as “increase power” and “leakage force” often appear. To learn this knowledge well, Students must profoundly understand and master the following two aspects: First, to correctly understand the nature and distinction of the three forces The nature of gravity belongs to gravitation, which is created by the mutual attraction of two objects. All objects on the Earth’s surface (in contact with the Earth) and all objects in the Earth’s vicinity (not in contact with the Earth) are attracted by the Earth, so they are all subjected to the force of gravity. The role of gravity point