LOL they're the energies of the masses relative to stationary (ground).ME wrote:To begin: your Energy values are useless... because energies only make sense when they relate to something, being relative to something.
Sorry, but non-sequitir? It hovers, relative to the ground. It does not change height. It has zero energy or momentum. It begins and ends with the same GPE. It has been used as reaction mass to raise a momentum.Your top weight may look stationary relative to the ground, but it's actually not and accelerates away from the CoM. It hoovers in that upright orientation.
Relative to the ground (the frame that counts, for now), it does not accelerate away from the CoM, or anything else; it does not move, period. The CoM accelerates down, away from it, however the CoM is not a particularly relevant factor here, since the jack is notionally massless (it could equally just be a pulley system), and only the lower mass is moving, and would thus need relifting..
Stationary "relative to the ground" is the only reference that matters, for all the motion here, or lack thereof..
..pretty much.. i think. We could test this in sim tho - only, i'm thinking, won't the bird also have to accelerate the 'pole' system downwards against its inertia? To my addled thinking, it might be more akin to a falling mass that is also pulling another mass sideways, or spinning up a wheel or whatever, so while the bird will experience a 1G force, its acceleration will be determined by A=F/m..When some bird thinks that top weight is a nice spot to land on, because from his perspective it's indistinguishable from any other pole, then it'll find itself a bit on unstable ground: the whole thing+bird will accelerate (<1G) downwards.
Only half-following this point - yes it's a non-inertial frame, albeit unconventionally. An accelerometer on-board will detect the net system accelerations. The sphere of fixed stars will turn into an accelerating tunnel. Maybe the "there but zero'd" bit will sink in after i go to bed, tired..Because things are in an accelerating Frame of reference, there's not a constant relation but a changing relation - hence that bird (while at rest after his super soft landing) shows a fictitious force (acceleration), which was already there but zero'd out.
At last that's my reasoning...
hmmm kinda - but would accelerometer readings support that interpretation? Not from the ground frame.. only the lower mass actually accelerates, and possesses all of the velocity.Your actuator accelerates two weights (m₁=1 kg, m₂=1 kg) with aₐ=19.6133 m/s² during ∆t=1 s.
Because m₁=m₂ they'll split the available force equally and both accelerate from their common center (CoM) with a₁=a₂=aₐ/2 = 9.80665 m/s²
Again, this is not what happens, reposting the sim here for easy reference:Their velocities at t=1 will be v₁=v₂ = a₁·t = 9.80665 m/s
![Image](http://www.besslerwheel.com/forum/files/n3_busted_1_127.gif)
...all the momentum and KE's on the one mass, matey..
yes, but again, that's just an arbitrary point in empty space. It has no mass. We're not counterbalancing the system or anything - the CoM doesn't seem a useful reference for anything at this stage..?Their distance from the CoM increases to d₁=d₂ = ½a₁·t² = 4.903325 m
Again, that's not what happens with gravity in the mix is it?Their energies are both ½m·v² = m·a·d = 48.0852 J (total=96.17038)
..again, the only objective reference frame here is earth / gravity's / the static frame. The energy and momentum contributed by the freefall is indeed irrelevant, and a zero-sum deal. It was simply a necessary formality in order to facilitate the asymmetric inertial interaction, which, relative to the ground, given that neither it nor the upper mass are actually accelerating upwards, has resulted in a net rise in momentum, between those interacting masses, relative to the ground..That's relative to their common center, no matter the orientation in freefall or happening in freespace (there that "bird" may be some space debris, but that would likely be a collision).
Your freefall (in this case) just doubles the total energy amount, but isn't relevant.. or so I think.
Aha, you're wrestling the same issue as Sleepy - why not just accelerate one mass against Earth? Same answer i gave him - the closed system of interacting masses has to be free to accumulate net momentum from the N3 exploit in order to be useful... otherwise you'd just have a reactionless propulsion system. But if you wanna get energy and work out of one to drive an attached load etc., the system has to be free to accelerate. Basically, the same reason Bessler's wheels were all statorless, and why he insisted this was a necessary condition for any "true PMM"...Better* to just have an actuator on the ground and shoot 1 kg up with 19.6133 m/s² (hopefully there's no bird around).
Or connect it to a bridge spanning a 10m deep valley and shoot 1kg down with 2G; you can always ditch the other 1 kg if you really want.
*) yeah well now you've made me doubt my own point... but it should be the same situation as your demo.Maybe true... I'll try to shut up for now. And attempt to watch from a distance. (Can't promise)[...] nothing i'm doing here is ever going to make sense to you..
But it's cool, you know i appreciate your interest..
:-)
Evidently, the "true PM", to him, must refer to a runaway momentum / divergent non-inertial frame / bleedin' N3 break, innit.. :P
Whatever, just give it another few days - it's either gonna crash'n'burn this weekend, or else take flight.. If i do have a reactionless rise in momentum then i should be able to rectify, consolidate and accumulate it over multiple cycles. That's the acid test..