When one tells that all physical properties are the same in one frame of reference (physical system), it just a description of our observations. In other words, it does not explain any physical nature of, say, the situation when astronauts can easily move various subjects (masses) onboard International Space Station, even though these masses including astronauts themselves have the colossal moments of Inertia as it is analyzed in another post “Rethinking the classical mechanics Part 5 of 10”. We just see that astronauts easily move distinct subjects (masses), so we say all physical properties are the same in International Space Station. However, how it happens that astronauts may easily move those subjects when an observer on the Earth surface cannot move them because those subjects have the colossal moment of Inertia with respect to him/her. What PHYSICALLY happens with astronauts and other orbiting bodies (masses) that they (astronauts) can easily move those masses inside International Space Station, but an observer on the Earth surface could not move the masses because the masses have the colossal moments of Inertia with respect to the observer?!