““Now let's assume that there is an external Mass acting gravitationally on some system that we observe. Then there are two possibilities: First the system may be kept from following the gravitational pull as though it were suspended by a rope; second, it may be able to move freely in reacting to the gravitational force. In the first of these cases, the system reacts to the outside gravitational pull with forces that compensate for it- say, its weight pulls on the rope and distorts it. In the second case, the system will freely follow the pull of gravity and will be accelerated accordingly. The centrifugal forces occurring in the process counteract the gravitational force of the external Mass such that an observer located within an accelerated system will feel that the system is at rest with respect to Absolute space. The implication is that the internal properties of small systems-and we will come back to the notion of small-make free fall and absolute rest indistinguishable.””
