在众多物理概念中,惯性这个东西可以说是独具魅力的.它看似简单却有说不清道不明的味道,说它是物理量吧,它却没有单位,说它不是物理量吧,它又有大小;再说对惯性的理解,错误认识还真不少.例如,物体不受外力作用时有惯性,物体受外力作用时没有惯性;物体静止或做匀速直线运动时有 In many physical concepts, inertia is a unique thing. It seems simple but there is no way to tell the taste of unclear. It is a physical quantity. It has no unit. It is not a physical quantity. It has The size; the understanding of inertia, there are a lot of wrong understanding. For example, the object does not have inertia when the external force, the object does not have inertia when the external force; the object is stationary or do a uniform linear motion