质点模型,是用一个具有同样质量,但没有大小和形状的点来代替实际物体,这是对实际物体的一种科学抽象。物体的形状和大小对所研究的问题不起作用或起次要作用是一个物体能否抽象为质点的依据。有些问题中的物体不满足此条件,如何将其抽象为质点,并按质点模型求解呢?一、提取质点若物体各部分的运动情况相同,则可在物体中取一质点,将物 The particle model replaces the actual object with a point of the same mass, but with no size and shape, which is a scientific abstraction of the actual object. The shape and size of an object does not work or plays a secondary role in the problem under study, which is the basis for the abstraction of an object as a particle. Some problems in the object does not meet this condition, how to abstract it as a particle, and particle model to solve it? First, the extraction of particles If the movement of the same parts of the object, you can take a point in the object, the object