Abstract
This is a basic study on how to prevent injuries related to flat glass, by clarifying the correlation between the strength of flat glass during private life at home. The study consists of two parts. This paper, as Part Two of the study, as Part Two of the study, deals with the strength of human impact estimated on existing data. It also proves that the correlation observed between the thus estimated human impact and the strength of flat glass obtained in Part One duly applies to the actual cases of flat glass breakage.