Ah, nitpicking ;-) You are right, gravity is not a force in itself, it causes a force due to the attraction observed between masses. Colloquial speech however simply states: "The force of gravity..." but it is true that gravity is not the force itself, as explained by this quote: "Gravity is most accurately described by the general theory of relativity (proposed by Albert Einstein in 1915) which describes gravity not as a force but as a consequence of the curvature of spacetime caused by the uneven distribution of mass/energy; and resulting in gravitational time dilation, where time lapses more slowly in lower (stronger) gravitational potential. However, for most applications, gravity is well approximated by Newton's law of universal gravitation, which postulates that gravity causes a force where two bodies of mass are directly drawn (or 'attracted') to each other according to a mathematical relationship, where the attractive force is proportional to the product of their masses and inversely proportional to the square of the distance between them." https://en.wikipedia.org/wiki/Gravitation
Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info http://www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: paul dove [mailto:[email protected]] Sent: Friday, August 26, 2016 7:49 PM To: Cor van de Water; Electric Vehicle Discussion List Subject: Re: [EVDL] Piezo-power> 10mi of freeway could charge all the EVs inBurbank-CA(?) Gravity is not a force. Friction is a force. Einsteinium theory of relativity proved this. Sent from my iPhone > On Aug 26, 2016, at 9:35 PM, Cor van de Water via EV <[email protected]> wrote: > > Rush is right in that the gravity is the force that slows down the > vehicle but not in the way you were thinking. > See, the way that the piezo elements can generate energy is by removing > it from a source, in this case the moving vehicle. > The piezo elements generate energy because a force works on them *and* > because they move (a force without movement by definition does not > generate energy). The movement of the Piezo elements is not > instantaneous, in fact they will generate the most energy when they only > yield slowly to the force, such that the largest possible force over the > largest possible time can act on them. > What does this mean for the movement of the road? Simple, when the > vehicle is entirely on the first piezo element, it is *not yet* > completely compressed, but it continues to be compressed while the > vehicle is already on it. Then when the vehicle reaches halfway, the > piezo element behind him has started to uncompress, but is not yet > halfway uncompressed and the piezo element in front of him is starting > to be compressed, but it is not yet halfway compressed. > The result of this is that the vehicle is driving a longer time on a > ramp upward than on a road that is tilting downward. And that is what is > causing the loss of energy, which is then harvested by the electricity > produced by the piezo elements. > It is quite simple Physics, but you need to take into account the > dynamic system, not the steady-state, because in the steady state that > was described, no energy is generated by the piezo elements (no movement > is no energy). > You can sketch a series of pictures where you assume that the piezo > elements continue compression for 1/4 of the roadway distance between > the piezo elements, the simple way of thinking about this is that they > respond 1/4 distance later than when they would respond instantaneously. > So, when the car is on top of element 1, it is 3/4 compressed while > element 2 is uncompressed > When the car is 1/4 distance down the road, element 1 is fully > compressed while element 2 is still uncompressed, about to start > compression. > When the car is halfway down the road, element 1 is back to 3/4 > compression while element 2 is 1/4 compressed > When the car is 3/4 down the road, both elements are halfway compressed > and finally the road is even. > When the car is on top of element 2, element 1 is only 1/4 compressed > and element 2 is 3/4 compressed so for the last 1/4 distance the car has > been able to drive down the ramp, but at this very point it is entering > the next section of roadway that is tilted up because the point where > the car is, is already compressed and the next element is still > uncompressed, so for 3/4 of the distance it will drive up a ramp (which > will "sink" while the car is on it, that is what causes the piezo > elements to generate power) > Hope this clarifies the Physics involved, there *is* a force generate in > the horizontal plane *by* the gravity, due to the tilted road, just like > climbing a hill causes you to lose kinetic energy. In this case, you are > not gaining potential energy like in the case of climbing the hill and > regaining it when you descend, but instead the "hill" is created by the > piezo elements that are generating energy, tapping from the forward > motion of the car. > > Cor van de Water > Chief Scientist > Proxim Wireless > > office +1 408 383 7626 Skype: cor_van_de_water > XoIP +31 87 784 1130 private: cvandewater.info > > http://www.proxim.com > > This email message (including any attachments) contains confidential and > proprietary information of Proxim Wireless Corporation. If you received > this message in error, please delete it and notify the sender. Any > unauthorized use, disclosure, distribution, or copying of any part of > this message is prohibited. > > > -----Original Message----- > From: EV [mailto:[email protected]] On Behalf Of via EV > Sent: Friday, August 26, 2016 6:58 PM > To: Rush Dougherty; Electric Vehicle Discussion List > Subject: Re: [EVDL] Piezo-power> 10mi of freeway could charge all the > EVs inBurbank-CA(?) > > >> I think you've forgotten about a little pesky thing called gravity... > and while >> the distances maybe similar, the energy needed to get the 'vehicle' > back up to >> the same level, the rise, is more than the energy gained on the fall. > > Best check your physics Rush. That same resistance to rising is what > makes objects crash into the ground. While there are losses, gravity > isn't one of them. > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA > (http://groups.yahoo.com/group/NEDRA) > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
