Another question is about the gravitational force. If all subjects (masses) onboard International Space Station have the colossal moment of Inertia and their moments do not depend on their speeds but only their rotation radii in according to this formula I = m*r , then what gravitational force should be to overcome such great moments of Inertia and pull those masses to the Earth center?!

It is known that spaceships or International Space Station or another orbiting body needs to decrease its speed to get into a lower orbital trajectory. However, how can it happen if all bodies (masses) which orbit the Earth have the tremendously large moments of Inertia and their moments do not depend on their speeds? How large should the gravitational force be to overcome their moments of Inertia?