cloud camper wrote:The motor does work lifting the weight which is then used to create momentum in the wheel. No gain that I can see.
But glad you're back!
Cheers ears, but i'll never let this lie - the biggest secret is simply knowing it's possible, for which we have Leibniz et al to thank.
Leibniz, the very man who
invented CoE - it's akin to having a videotaped interview of Albert Einstein lucidly recounting how he was abducted by aliens on multiple occasions..
Yes, the motor does work applying torque to the lever, and counter-torque back to the wheel.
The momenta induced by these torques are equal and opposite, and all cancel out to zero when the weight parks in the center of the wheel (as demonstrated in the no-gravity example).
Likewise, the momenta and counter-momenta intrinsic to a GPE interaction usually cancel out to zero - to push a weight upwards, we must propel the Earth downwards, and when the weight reaches its zenith and falls back down, the Earth falls back up in reciprocation; net change in momentum is nil.
So while i'm not necessarily disagreeing with your conclusion - the momentum is obviously produced by the confluence of the inertial interaction and gravitational interaction - we nonetheless have no net change in height (weight begins and ends at equal height), so we
do not have the option of attributing the momentum gain to a drop in GPE - there's been no net output or input of GPE.
Yet if the momentum hasn't come from the GPE interaction, that only leaves the inertial interaction - the torque and counter-torques, and the momentum and counter-momentum they produced.
And again, as the no-gravity case shows (if a demo were even necessary), an inertial interaction shouldn't cause a net rise in momentum either..
Hence my assertion that the fact that both together
do produce a momentum gain, is not trivial!
Acting in concert, the two interactions produce a result that neither on its own should ever be capable of!
It
is disarmingly simple, and all the better if it seems perfectly straightforwards... but it also seems to be breaking a fundamental rule that neither interaction on its own is able to accomplish.
As ever, generating a net rise in momentum is only half the battle - the energy gain only comes from consolidating that momentum gain over successive cycles.
And
then, only if its energy cost of operation remains constant - that is, if we can pay the same input energy to buy the same amount of momentum (wherever its coming from), accumulating it and building it up over repeated cycles, then mathematically:
• if we can consistently pay, say, ½ Joule per kg-m^2 of momentum, then 10 kg-m^2 costs 5 J
• yet according to KE=½mV^2, if our first kg-m^2 costs ½ J, then the second should cost 2 J, and the third, 4.5 J and so on; hence 10 kg-m^2
should ordinarily cost 50 J. But regardless of how much we actually paid for it, it's still
worth 50 J - it'll perform 50 Joules of mechanical work, converting it to GPE or KE or sprung PE or whatever...
• Hence the mere act of accumulating momentum this way is an inherently over-unity process - our net efficiency keeps increasing, the more momentum we invest in.
I cannot stress enough that
there is no other process in physics that does this!!!
What Leibniz et al were describing - Bessler himself - was excess mechanical energy. OU KE. Only an effective momentum asymmetry can accomplish this, and it is only possible in a wheel in which "everything must, of necessity, go around together"...
There is simply no way that Bessler could've deduced, from 1st principles known at that time, that "in a true PMM, everything must go around together" - the
vis viva dispute hadn't yet been settled; Newton was saying mV, Leibniz mV^2, neither were exactly right or wrong - so he must be speaking from practical experience. He's
experimentally nailed the decisive principle, that what we would today describe as an "OU motor" is essentially an ordinary motor in which the stator rotates along with the rotor.
In other words, the only type of mechanical OU possible is a motor in which torque is applied between a rotor and stator, but then the momentum imparted to the rotor is shared back with the stator, so that both are rotating together, and then this process is repeated, gaining more momentum each cycle. Ie. a motor hauling itself around by its own bootstraps, albeit with a lil' help from gravity..