chapter  20
4 Pages

## The Equality of Inertial and Gravitational Mass as an Argument for the General Postulate of Relativity

Relying on his knowledge of the gravitational ﬁeld (as it was discussed in the preceding section), the man in the chest will thus come to the conclusion that he and the chest are in a gravitational ﬁeld which is constant with regard to time. Of course he will be puzzled for a moment as to why the chest does not fall in this gravitational ﬁeld. Just then, however, he discovers the hook in the middle of the lid of the chest and the rope which is attached to it, and he consequently comes to the conclusion that the chest is suspended at rest in the gravitational ﬁeld.