HELP!me plz rev. 1?

Question

For my simplicity here let’s assume a little guy/orbit pilot (employer is nature) rides in an orbiting object and he must navigate the satellite around the correct orbit. I assume he only needs a velocity controller. He has two instruments to look at. (1)A gravity indicator (ft/sec^2) which detects all gravity sources action on the satellite. (2) A centripetal force indicator [(ft/sec^2)]. He must keep the two indicators reading the same values or his employment will be terminated without benefits (I would hate having his job). THIS IS MY QUESTION. What external force does the centripetal detector sense (velocity) to display the correct value? I’m guessing the detector is detecting something at right angle to vertical forces of gravity acting on the detector. What is it????

(1) Feel free to correct my little scenario if need be, excluding grammar. If you can’t help yourself from considering grammar then go ahead.

(1a) Are other instruments needed?

(2) Describe how you would build the detectors if you feel like it.

(3) Just for grins (I’m joking here) is the KE detector detecting an analog or digital force?

starts off the correct orbital path a gravity detection meter needle would deflect? Assume the needle is centered on “0” mid scale while weightless then deflect left or right to indicate the satellite is wandering off the correct orbit path when the gravity forces are not balanced? Maybe like inertia navigation which I’m not familiar with. I don’t think nature uses GPS Thanks campbelp2002. Would it be fair to assume if the satellite or radar so I would rather stick with instruments that detect the natural forces action on the satellite.

Thanks campbelp2002. Would it be fair to assume if the satellite starts off the correct orbital path a gravity detection meter needle would deflect? Assume the needle is centered on “0” mid scale while weightless then deflect left or right to indicate the satellite is wandering off the correct orbit path when the gravity forces are not balanced? Maybe like inertia navigation. I don’t think nature uses GPS or radar so I would rather stick with instruments that detect the natural forces action on the satellite.

Looks like it’s about time for rev 2. It seems the little orbit pilot guy may only need one instrument. A differential gravity meter, which could also be called an acceleration meter may be all that’s needed here. If he starts off the correct orbit path the needle will deflect a little so all he needs to do is speed up or slow down to keep the needle centered on 0 gravity. He isn’t concerned about his velocity. All he needs to do is keep the needle centered. But now I’m back to my original confusion. The satellite must have kinetic energy be in orbit or it would fall. Velocity is a key ingredient in kinetic energy. The velocity must be relative to something. It’s apparently not the earths mass or geo stationary orbits wouldn’t be possible. Apparently it’s the gravity field which is stationary relative to the universe (a warp in space like an indention in a trampoline when Britney Spears bounces on it) but I can’t understand the forces at work here regarding KE.

Answer 1

In orbit no gravity detector is possible because everything is weightless. All the gravity sources result in the orbiting body accelerating in some direction, but the result of that acceleration is weightlessness, so no instrument could detect the force of gravity in that case. The best you can do is use radar or optical surveying methods to measure how fast you are going with respect to some planet every second, and calculate from the changing speed and direction what the gravity must be that is causing the changes. An orbit is not a delicate balance between the pull of gravity and the centrifugal force of the orbital motion. If it were, planets, asteroids and all artificial satellites would quickly fall out of orbit for lack of correct control. Instead, orbiting things will speed up under the influence of gravity if they get too close to a gravity source and slow down if they get too far from a gravity source. This results in an elliptical orbit.

Answer 2

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