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nuckolls.bob(at)aeroelect
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 Posted: Thu Dec 12, 2013 2:46 pm Post subject: Speaking of physics . . . |
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Last week I had occasion to refer a colleague to
a series of videos available from MIT on their
website at http://ocw.mit.edu
In particular the lectures offered by Walter Lewin
on various topics in physics. Highly recommended
for anyone interested in a refresher . . . or grandparents
hoping to plant the seeds of interests in
grandchildren.
Bob . . .
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uuccio(at)gmail.com
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| Posted: Thu Dec 12, 2013 3:27 pm Post subject: Speaking of physics . . . |
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Hi Bob
Any particular one which is relevant to aero electrics? There are 567 hits for Walter Lewin lectures on the site...
Sacha
On Dec 12, 2013, at 23:45, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: |
Last week I had occasion to refer a colleague to
a series of videos available from MIT on their
website at http://ocw.mit.edu
In particular the lectures offered by Walter Lewin
on various topics in physics. Highly recommended
for anyone interested in a refresher . . . or grandparents
hoping to plant the seeds of interests in
grandchildren.
Bob . . .
|
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Fri Dec 13, 2013 5:52 am Post subject: Re: Speaking of physics . . . |
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Bob, et al.--- Walter Lewin is great stuff!
_____________________
I posted: Thu Sep 12, 2013 9:31 am
Off Topic:
When you think you understand electronics, see Google: " You Tube
M I T Walter Lewin Complete Breakdown of Intuition Part 1 "
If you are really brave see Part 2.
_____________________
Also, any You Tube re: Richard Feynman.
Merry Xmas
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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nuckolls.bob(at)aeroelect
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| Posted: Fri Dec 13, 2013 9:53 am Post subject: Speaking of physics . . . |
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At 07:52 AM 12/13/2013, you wrote:
| Quote: |
Bob, et al.--- Walter Lewin is great stuff!
|
Yeah, he's one of my heros.
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Fri Dec 13, 2013 10:12 am Post subject: Speaking of physics . . . |
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At 05:26 PM 12/12/2013, you wrote:
| Quote: |
Hi Bob
Any particular one which is relevant to aero electrics? There are
567 hits for Walter Lewin lectures on the site...
Sacha
|
ALL are relevant.
EVERY discipline reduced to the most fundamental
components will invariably illustrate principals
of motion, force, friction, dissipation of energy,
radiation, behaviors of materials, etc. etc.
I invoked a sampling of these ideas in our consideration
of risk for "loose items in cockpit" causing near
catastrophic events and a consideration of likelihood
that a slide switch is more resistant to vibration than
a toggle switch.
A great deal of what passes for considered decision
making is based on conclusions unsupported by the simple-ideas
in physics. Much of what I did during my last years
at Beech was to discover the constellation of operating
simple-ideas responsible for failure to perform . . .
troubleshooting down to the lowest common denominator.
A solid grounding in physics is the cornerstone
of virtually every other discipline . . . the whole
universe and every system within runs on simple-ideas
in physics.
Bob . . .
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jan(at)CLAVER.DEMON.CO.UK
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jluckey(at)pacbell.net
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| Posted: Fri Dec 13, 2013 4:19 pm Post subject: Speaking of physics . . . |
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Bob,
Your cursory and simplified analysis of the dynamics of switch vibration neither has sufficient data nor analysis to draw any conclusions. (I don't think you intended it to) Therefore it neither confirms nor refutes the suggestion that sliders are used because they handle vibration better in RC applications.
Let's talk about "..loose items ..":
I know you are not saying that the idea of "..loose items in the cockpit.." is impossible. In other words, I believe we agree that it is possible for foreign objects to get stuck in bad places. However, you seem to be rather dismissive of the ideas I have put forward. The crux of your argument seems to be based on the likelihood of a particular bad event.
Therein lies the problem - how to derive the likelihood. I suppose one could scour NTSB accident records to search for incidents of bad thing X happening. (But that requires a larger amount of effort than most of us are willing or able to put forth. There are other considerations in doing research of this nature - suffice it to say it is not a trivial task)
Therefore, in the absence of a probability for an event that is perhaps unlikely but not impossible, I offer the following idea:
If there is a simple, easy, & cheap prophylactic action that can be taken to prevent something bad, even if the bad thing is statistically remote (or the statistics are unknown), then why not take that action?
The "why not" question is important because even seemingly benign solutions have pros & cons and we certainly don't want the cure to be worse than the disease. I ask that "why not..." question a lot and lately have been getting less than satisfying answers.
-Jeff
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
To: aeroelectric-list(at)matronics.com
Sent: Friday, December 13, 2013 10:12 AM
Subject: Re: Speaking of physics . . .
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
At 05:26 PM 12/12/2013, you wrote:
| Quote: | --> AeroElectric-List message posted by: Sacha <uuccio(at)gmail.com (uuccio(at)gmail.com)>
Hi Bob
Any particular one which is relevant to aero electrics? There are 567 hits for Walter Lewin lectures on the site...
Sacha
|
ALL are relevant.
EVERY discipline reduced to the most fundamental
components will invariably illustrate principals
of motion, force, friction, dissipation of energy,
radiation, behaviors of materials, etc. etc.
I invoked a sampling of these ideas in our consideration
of risk for "loose items in cockpit" causing near
catastrophic events and a consideration of likelihood
that a slide switch is more resistant to vibration than
a toggle switch.
A great deal of what passes for considered decision
making is based on conclusions unsupported by the simple-ideas
in physics. Much of what I did during my last years
at Beech was to discover the constellation of operating
simple-ideas responsible for failure to perform . . .
troubleshooting down to the lowest common denominator.
A solid grounding in physics is the cornerstone
of virtually every other discipline . . . the whole
universe and every system within runs on simpe Support Your Lists This Month get="_blank" href="http://www.aeroelectric.com/">www.aeroelectric.comwww.mypilotstList Contribution Web -==========================
[quote][b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Fri Dec 13, 2013 4:59 pm Post subject: Speaking of physics . . . |
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Someone, I know not who, once said there are two kinds of airplanes, perfect airplanes and those that fly. I once saw a Long EZ fuselage on which the builder had spent 16 years addressing every little whim he'd ever had about the perfect Long EZ. He died without ever seeing it take to the air. When I saw it, it was on its way to its third owner and still had no wings or canard. The step that deployed automatically with the canopy opening was pretty cool, though.
Rick Girard
do not archive
On Fri, Dec 13, 2013 at 6:17 PM, Jeff Luckey <jluckey(at)pacbell.net (jluckey(at)pacbell.net)> wrote:
| Quote: | Bob,
Your cursory and simplified analysis of the dynamics of switch vibration neither has sufficient data nor analysis to draw any conclusions. (I don't think you intended it to) Therefore it neither confirms nor refutes the suggestion that sliders are used because they handle vibration better in RC applications.
Let's talk about "..loose items ..":
I know you are not saying that the idea of "..loose items in the cockpit.." is impossible. In other words, I believe we agree that it is possible for foreign objects to get stuck in bad places. However, you seem to be rather dismissive of the ideas I have put forward. The crux of your argument seems to be based on the likelihood of a particular bad event.
Therein lies the problem - how to derive the likelihood. I suppose one could scour NTSB accident records to search for incidents of bad thing X happening. (But that requires a larger amount of effort than most of us are willing or able to put forth. There are other considerations in doing research of this nature - suffice it to say it is not a trivial task)
Therefore, in the absence of a probability for an event that is perhaps unlikely but not impossible, I offer the following idea:
If there is a simple, easy, & cheap prophylactic action that can be taken to prevent something bad, even if the bad thing is statistically remote (or the statistics are unknown), then why not take that action?
The "why not" question is important because even seemingly benign solutions have pros & cons and we certainly don't want the cure to be worse than the disease. I ask that "why not..." question a lot and lately have been getting less than satisfying answers.
-Jeff
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Sent: Friday, December 13, 2013 10:12 AM
Subject: Re: Speaking of physics . . .
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
At 05:26 PM 12/12/2013, you wrote:
> --> AeroElectric-List message posted by: Sacha <uuccio(at)gmail.com (uuccio(at)gmail.com)>
| Quote: |
Hi Bob
Any particular one which is relevant to aero electrics? There are 567 hits for Walter Lewin lectures on the site...
> Sacha
|
ALL are relevant.
EVERY discipline reduced to the most fundamental
components will invariably illustrate principals
of motion, force, friction, dissipation of energy,
radiation, behaviors of materials, etc. etc.
I invoked a sampling of these ideas in our consideration
of risk for "loose items in cockpit" causing near
catastrophic events and a consideration of likelihood
that a slide switch is more resistant to vibration than
a toggle switch.
A great deal of what passes for considered decision
making is based on conclusions unsupported by the simple-ideas
in physics. Much of what I did during my last years
at Beech was to discover the constellation of operating
simple-ideas responsible for failure to perform . . .
troubleshooting down to the lowest common denominator.
A solid grounding in physics is the cornerstone
of virtually every other discipline . . . the whole
universe and every system within runs on simpe Support Your Lists This Month get="_blank" href="http://www.aeroelectric.com/">www.aeroelectric.comwww.mypilotstList Contribution Web -==========================
| Quote: |
_blank">www.aeroelectric.com
.com" target="_blank">www.buildersbooks.com
="_blank">www.homebuilthelp.com
="_blank">www.mypilotstore.com
ank">www.mrrace.com
_blank">http://www.matronics.com/contribution
ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
tp://forums.matronics.com
|
|
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
[quote][b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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_________________
The smallest miracle right in front of you is enough to make you happy.... |
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jan(at)CLAVER.DEMON.CO.UK
Guest
|
| Posted: Sat Dec 14, 2013 6:18 am Post subject: Speaking of physics . . . |
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Rick,
Very interesting analysis .. one point to consider .. You could also say that you have two sorts of ‘builder/pilots’ …
Ones than like to build more than to fly …
And the ones that like to fly more than they build …
After all … we all look for pleasure in many ways …. J
Jan
Do not archive
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Richard Girard
Sent: 14 December 2013 00:58
To: aeroelectric-list(at)matronics.com
Subject: Re: AeroElectric-List: Speaking of physics . . .
Someone, I know not who, once said there are two kinds of airplanes, perfect airplanes and those that fly. I once saw a Long EZ fuselage on which the builder had spent 16 years addressing every little whim he'd ever had about the perfect Long EZ. He died without ever seeing it take to the air. When I saw it, it was on its way to its third owner and still had no wings or canard. The step that deployed automatically with the canopy opening was pretty cool, though.
Rick Girard
do not archive
On Fri, Dec 13, 2013 at 6:17 PM, Jeff Luckey <jluckey(at)pacbell.net (jluckey(at)pacbell.net)> wrote:
Bob,
Your cursory and simplified analysis of the dynamics of switch vibration neither has sufficient data nor analysis to draw any conclusions. (I don't think you intended it to) Therefore it neither confirms nor refutes the suggestion that sliders are used because they handle vibration better in RC applications.
Let's talk about "..loose items ..":
I know you are not saying that the idea of "..loose items in the cockpit.." is impossible. In other words, I believe we agree that it is possible for foreign objects to get stuck in bad places. However, you seem to be rather dismissive of the ideas I have put forward. The crux of your argument seems to be based on the likelihood of a particular bad event.
Therein lies the problem - how to derive the likelihood. I suppose one could scour NTSB accident records to search for incidents of bad thing X happening. (But that requires a larger amount of effort than most of us are willing or able to put forth. There are other considerations in doing research of this nature - suffice it to say it is not a trivial task)
Therefore, in the absence of a probability for an event that is perhaps unlikely but not impossible, I offer the following idea:
If there is a simple, easy, & cheap prophylactic action that can be taken to prevent something bad, even if the bad thing is statistically remote (or the statistics are unknown), then why not take that action?
The "why not" question is important because even seemingly benign solutions have pros & cons and we certainly don't want the cure to be worse than the disease. I ask that "why not..." question a lot and lately have been getting less than satisfying answers.
-Jeff
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Sent: Friday, December 13, 2013 10:12 AM
Subject: Re: AeroElectric-List: Speaking of physics . . .
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
At 05:26 PM 12/12/2013, you wrote:
> --> AeroElectric-List message posted by: Sacha <uuccio(at)gmail.com (uuccio(at)gmail.com)>
>
> Hi Bob
> Any particular one which is relevant to aero electrics? There are 567 hits for Walter Lewin lectures on the site...
> Sacha
ALL are relevant.
EVERY discipline reduced to the most fundamental
components will invariably illustrate principals
of motion, force, friction, dissipation of energy,
radiation, behaviors of materials, etc. etc.
I invoked a sampling of these ideas in our consideration
of risk for "loose items in cockpit" causing near
catastrophic events and a consideration of likelihood
that a slide switch is more resistant to vibration than
a toggle switch.
A great deal of what passes for considered decision
making is based on conclusions unsupported by the simple-ideas
in physics. Much of what I did during my last years
at Beech was to discover the constellation of operating
simple-ideas responsible for failure to perform . . .
troubleshooting down to the lowest common denominator.
A solid grounding in physics is the cornerstone
of virtually every other discipline . . . the whole
universe and every system within runs on simpe Support Your Lists This Month get="_blank" href="http://www.aeroelectric.com/">www.aeroelectric.comwww.mypilotstList Contribution Web -==========================
| Quote: | | _blank">www.aeroelectric.com.com" target="_blank">www.buildersbooks.com="_blank">www.homebuilthelp.com="_blank">www.mypilotstore.comank">www.mrrace.com_blank">http://www.matronics.com/contributionist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-Listtp://forums.matronics.com |
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
0123456789 | Quote: | | _blank">www.aeroelectric.com |
0 | Quote: | | _blank">www.aeroelectric.com |
1 | Quote: | | _blank">www.aeroelectric.com |
2 | Quote: | | _blank">www.aeroelectric.com |
3 | Quote: | | _blank">www.aeroelectric.com |
4 | Quote: | | _blank">www.aeroelectric.com |
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9 | Quote: | | .com" target="_blank">www.buildersbooks.com |
0 | Quote: | | .com" target="_blank">www.buildersbooks.com |
1 | Quote: | | .com" target="_blank">www.buildersbooks.com |
2 | Quote: | | .com" target="_blank">www.buildersbooks.com |
3 | Quote: | | .com" target="_blank">www.buildersbooks.com |
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5 | Quote: | | .com" target="_blank">www.buildersbooks.com |
6 | Quote: | | .com" target="_blank">www.buildersbooks.com |
7 | Quote: | | .com" target="_blank">www.buildersbooks.com |
8 | Quote: | | .com" target="_blank">www.buildersbooks.com |
9 | Quote: | | ="_blank">www.homebuilthelp.com |
0 | Quote: | | ="_blank">www.homebuilthelp.com |
1 | Quote: | | ="_blank">www.homebuilthelp.com |
2 | Quote: | | ="_blank">www.homebuilthelp.com |
3 | Quote: | | ="_blank">www.homebuilthelp.com |
4 | Quote: | | ="_blank">www.homebuilthelp.com |
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9 | Quote: | | ="_blank">www.mypilotstore.com |
0 | Quote: | | ="_blank">www.mypilotstore.com |
1
[quote][b]
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Sat Dec 14, 2013 2:46 pm Post subject: Speaking of physics . . . |
|
|
At 06:17 PM 12/13/2013, you wrote:
| Quote: | Bob,
Your cursory and simplified analysis of the dynamics of switch
vibration neither has sufficient data nor analysis to draw any
conclusions. (I don't think you intended it to) Therefore it neither
confirms nor refutes the suggestion that sliders are used because
they handle vibration better in RC applications.
|
Okay, what is the counter-argument for
the effects of vibration in the system of levers
and masses? What are the forcing functions that
would separate a pair of toggle switch contacts
undergoing vibration?
If I am in error, nobody is more interested in
knowing than me . . . Prof Lewin once offered the
idea that bad teaching is a form of criminal behavior.
It's a matter of personal satisfaction and moral
imperative that a teacher strive for the best.
| Quote: | Let's talk about "..loose items ..":
I know you are not saying that the idea of "..loose items in the
cockpit.." is impossible. In other words, I believe we agree that it
is possible for foreign objects to get stuck in bad
places. However, you seem to be rather dismissive of the ideas I
have put forward. The crux of your argument seems to be based on
the likelihood of a particular bad event.
|
Not at all. The outcome of damage to multiple
wires by burning due to electrical fault was
founded on the notion that some loose, conductive
item could become lodged between source and
ground with conductivity that would burn
a bus feeder. All the metal pens I've seen
were light, thin walled and poor conductors.
Walking up to a bus bar with malicious intent
armed with a metallic writing instrument is like
bringing a cork gun to a gunfight. Yes, there's
going to be sparks, smoke, heat and probably burned
fingers with little or no damage to the bus
or its feeder.
The fact that such feeders tend to "eat holes"
in their antagonists with little or no risk to
the feeder or functions that it energizes is the
foundation for policies articulated in the FARS
and decades-old industry practice for over a
quarter million light aircraft produced in this
country alone.
| Quote: | Therein lies the problem - how to derive the likelihood. I suppose
one could scour NTSB accident records to search for incidents of bad
thing X happening. (But that requires a larger amount of effort
than most of us are willing or able to put forth. There are other
considerations in doing research of this nature - suffice it to say
it is not a trivial task)
|
. . . and based on my experience, analysis and observations
I'll suggest that you will not find such an event in
the NTSB records . . .
I have oft repeated the observation that only an
exceedingly small number of accidents have electrical
systems malfunctions as proximate cause . . . and
of those cases, another small fraction are based
on failure to perform to design goals. When electrics
fail to perform, it nearly always finds foundation in human
errors of installation or maintenance.
| Quote: | Therefore, in the absence of a probability for an event that is
perhaps unlikely but not impossible, I offer the following idea:
If there is a simple, easy, & cheap prophylactic action that can be
taken to prevent something bad, even if the bad thing is
statistically remote (or the statistics are unknown), then why not
take that action?
|
As you wish . . . but how far do you carry this
line of reasoning? Would it be a good idea to
build a cage around the prop . . . a guard on a
fuel selector valve to guard against accidentally
kicking it? How about warning lights on the fuel
filler caps to warn of poor sealing (had these
critters siphon gas on an A36 . . . TWICE!)
| Quote: | The "why not" question is important because even seemingly benign
solutions have pros & cons and we certainly don't want the cure to
be worse than the disease. I ask that "why not..." question a lot
and lately have been getting less than satisfying answers.
|
I sincerely strive for my answers to be founded
in the simple-ideas of physics and practical
limits for guarding against the unanticipated
based on lessons learned.
The first time I saw this image was probably 35
years ago . . . and rather humorous at the time . .
http://healthyworker.files.wordpress.com/2013/01/osha_cowboy.jpg
It's interesting to contemplate what the "Engineer/
mechanic/pilot after FAA" would be decked out.
Over 35+ years, the work product of those with
profitable careers in worrying-on-our-behalf-for-
the-greater-good have offered a constellation of mandates
to address a host of 'why not?' . . . with little
if any observable change in accident rates or causation
for those accidents.
If you find satisfaction in guarding the bus bars
on your breaker panels or fusing the feeder, please
do so. It would upset nobody that I'm aware of. Your
airplane be fabricated to meet your design goals.
I am sorry to have failed your expectations for receiving
'satisfying answers'. All I can do is offer the best
I know now to do founded on a knowledge-base built on
my teachers, experiences, recipes for success . . .
combined with observations on experiences of others.
Bob . . .
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mrspudandcompany(at)veriz
Guest
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| Posted: Sat Dec 14, 2013 6:21 pm Post subject: Speaking of physics . . . |
|
|
[quote]
If there is a simple, easy, & cheap prophylactic action that can be taken to prevent something bad, even if the bad thing is statistically remote (or the statistics are unknown), then why not take that action?
The "why not" question is important because even seemingly benign solutions have pros & cons and we certainly don't want the cure to be worse than the disease. I ask that "why not..." question a lot and lately have been getting less than satisfying answers.
-Jeff
| Quote: | Sounds like you are not feeling very Lucky! ☺
Roger
Do not archive
|
[b]
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Fred Klein
Joined: 26 Mar 2012
Posts: 503
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| Posted: Sat Dec 14, 2013 10:04 pm Post subject: Speaking of physics . . . |
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OK...so a robot walks into a bar, hops on a stool, and turns to the guy next to him..."So whazz' happenen man?..."
And the guys goes into a long rant about his troubles w/ his self-centered sweetie...
The robot responds, "Man...I know just how you feel...I tried to have a relationship with a MacBook...just couldn't make it work...all I ever got was 'iThis', 'iThat', 'iThis', 'iThat'..."
do not archive
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Sun Dec 15, 2013 7:25 am Post subject: Re: Speaking of physics . . . |
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For anyone who thought HS or college physics was incomprehensible, and apropos of this group, look at this page: http://amasci.com/wing/airgif2.html
For those who want to experience physics without math, Buy a few copies of "Conceptual Physics" by Paul Hewitt. It is great to start students off on the right track. Not too late for Xmas.
There's lots of great stuff on the Internet.
I write on subjects related to physics on "Perihelion Science Fiction". Perihelion Design is the name of my website. Yes, I named them both...but it's a long story. I should be driving rivets....
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
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rlborger(at)mac.com
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| Posted: Sun Dec 15, 2013 7:49 am Post subject: Speaking of physics . . . |
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Fred,
Glad you put a “do not archive” on that one ;^)
Bob
On Dec 15, 2013, at 12:02 AM, Fred Klein <fklein(at)orcasonline.com> wrote:
OK...so a robot walks into a bar, hops on a stool, and turns to the guy next to him..."So whazz' happenen man?..."
And the guys goes into a long rant about his troubles w/ his self-centered sweetie...
The robot responds, "Man...I know just how you feel...I tried to have a relationship with a MacBook...just couldn't make it work...all I ever got was 'iThis', 'iThat', 'iThis', 'iThat'..."
do not archive
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nuckolls.bob(at)aeroelect
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| Posted: Sun Dec 15, 2013 9:25 am Post subject: Speaking of physics . . . |
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At 09:25 AM 12/15/2013, you wrote:
| Quote: |
For those who want to experience physics without math, Buy a few
copies of "Conceptual Physics" by Paul Hewitt. It is great to start
students off on the right track. Not too late for Xmas.
|
Agreed. I've given away a number of these
books. Highly recommended ESPECIALLY
for grandparents looking for interesting
things to do with grandchildren not
completely distracted/disoriented by
the chaotic input of 'data' in their
daily lives.
Bob . . .
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jluckey(at)pacbell.net
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| Posted: Sun Dec 15, 2013 9:38 am Post subject: Speaking of physics . . . |
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while the grown-ups are talking, can the eight-year-olds go play in the other room ...
www.mypilotstore.com[/url]
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