6 DOF closed loop

I think its no more than assuming a determined reference system. Everything is relative, said Einstein.

And... it does move the Earth. But the variation in movement quantity of the Earth in comparison to the dogs tail is infinitely small - because the Earth mass is infinitely big.

Remembered me another good one...

I've heard some guys installed a neutron detector in Europe. It was located around 18 km from the source laboratory, and located below the surface. The detector was no less than a 20 ton steel target facing the direction of the source. The idea is that neutrons were able to travel through soil but would be caught in the massive steel target.

How do they measure some neutrons variations in a 20 ton steel target is a complete mistery to me. But maybe you may use the same grade of hardware to measure the Earth movement.

You can see this pretty easily by just laying a hydraulic cylinder on a linear bearing (or any slick surface). Hit it with a couple hundred psi and see what moves. Kind of like the time when I was a dumb kid (as opposed to a dumb senior citizen) and set off a 45 cal bullet on a stump instead of in a gun. Boy, did that brass fly backwards! It's all a matter of mass.

An action causes an equal and opposite reaction. The Earth DOES move, but too little for you to notice it.

When the platform moves forward in fixed space, it produces a force that pushes the Earth backward. When the platform stops moving, the force that decelarates it pulls decelarates the Earth in the opposite direction.

You won't feel the Earth moving because Earth's mass is so much greater than the platform's ... the platform's comparatively small mass times its speed equals the Earth's huge mass times ITS speed. Because of the difference in masses, you get an opposite difference in speeds.

DZ

Hmmm, thanks!

Gonna have to think about that.