[Blindmath] physics/mathematics problem; have a solution?

Ken Perry kperry at blinksoft.com
Mon Dec 19 08:31:34 CST 2011


Surely there is a way to do it without impressions on the ground.  Take one
of my examples in case I was newly blind in a hospital not trained with a
cane yet I had one.  I was walking around freely thinking I was doing great
when I found a place where they park the wheel chairs.  Note the wheel
chairs are under 3 foot tall so they have a half wall they park them under.
My cane detected no problems so I was walking at about 2.5 miles per hour.
I hit the wall chest level.  There was no indentation either on the wall or
on the floor where my head and back hit.  Yet there must be some kind of way
to tell the force when a 180 pound person walking 2.5 miles an hour hits at
chest level either the wall or falling onto his back with feet in air?

ken
-----Original Message-----
From: blindmath-bounces at nfbnet.org [mailto:blindmath-bounces at nfbnet.org] On
Behalf Of Michael Whapples
Sent: Monday, December 19, 2011 9:02 AM
To: Blind Math list for those interested in mathematics
Subject: Re: [Blindmath] physics/mathematics problem; have a solution?

Coming back to your original question, you could do it without knowing the
time, however the time would still not be zero.

You could do it by considering what energy was absorbed in the impact and
what distance the force was acting for. I guess a way of calculating the
distance might be to use the size of the impression you left on the ground
and the indent the ground left on you. Well may be a bit more than just what
is left should either the ground or you restore your shape after the force
is removed. Also it may or may not be significant, if falling don't forget
that there is a change in gravitational potential energy when moving
vertically, it possibly is not relevant in this case as I doubt either
indent was that large.

Also don't forget either using time or distance, these will assume force is
constant over that period and so is an average. If you want the maximum
force then I am not sure it can be calculated with what is known here and
probably would require you to repeat it with something to measure the
pressure/force, either presenting the maximum or taking readings constantly
and then you could process that. While it might be interesting to know, I am
not sure I would want to do that just to find out what force was
encountered.

Michael Whapples
On 19 Dec 2011, at 13:25, David Engebretson Jr. wrote:

> Sun lamp was fully intact.  I didn't purposely protect it with care, but
it came out of the pit before I did.  No oxygen intake for me at that point.
Innate mover and protector ability, I think.
> 
> Ew, I know that seeing stars thing... I was moving a photo processor once.
The entrance for the photo paper was only about 4 feet tall (hmmm,
coincidence?) and I was unscrewing the front cover and forgot the wall was
so short.  I stood up really fast to get the next screw quickly since I was
getting paid by the hour and like to be worth an employers time.  Top of
head bonk at 4 feet trying to move as quickly as possible vertically and
horizontally at the same time from a crouching position.  I saw stars and
lost at least one inch of height due to neck compression.  Don't think I
ever healed from that one.
> 
> Still moved the processor that evening, but might have had to take a
couple of days off once the concussion or whatever it was took full affect.
> 
> I think math and physics analysis in an embedded systems environment is
much safer for most blind folk.  Especially if said blind people are
energetic (er, stupid) enough to get him/her self in trouble with physical
injury.
> 
> Aw heck, sometimes a little physical pain is good for the body.  Puts hair
on your chest, right?
> 
> Best,
> D
> 
> ----- Original Message ----- From: "Ken Perry" <kperry at blinksoft.com>
> To: "'Blind Math list for those interested in mathematics'"
<blindmath at nfbnet.org>
> Sent: Monday, December 19, 2011 4:32 AM
> Subject: Re: [Blindmath] physics/mathematics problem; have a solution?
> 
> 
>> Ha you should not be ashamed the ones that are ashamed are the ones who
do
>> not know they can be as crazy as the sited folks.  One of my favorite
miss
>> haps close to yours was carrying 50 pounds of roofing tile up two floors
on
>> a rickety ladder to teach my teenager how to patch a roof.  Now this is
all
>> after running into a power pole with the previously mentioned 50 pounds
of
>> roofing tiles balanced on my head showing off.  Can someone come up with
the
>> formula for a 180 pound guy hitting the ground from 5 foot 3 and a
quarter
>> up and waiting for a 50 pound pile of roofing tiles which landed, yup
that's
>> right on my head?  All I can say is whatever force is calculated is the
same
>> force needed to make stars.  Anyway  I know sited people who have done
worse
>> than us and they can see.  I am just glad that I can still do all the
wood
>> working and you name it that I still do I would be ashamed if I gave it
all
>> up just because of a bit of universal star creation. Hey did you break
the
>> lamp?  I bet you didn't.
>> 
>> 
>> 
>> Ken
>> 
>> -----Original Message-----
>> From: blindmath-bounces at nfbnet.org [mailto:blindmath-bounces at nfbnet.org]
On
>> Behalf Of David Engebretson Jr.
>> Sent: Monday, December 19, 2011 7:10 AM
>> To: Blind Math list for those interested in mathematics
>> Subject: Re: [Blindmath] physics/mathematics problem; have a solution?
>> 
>> Ken,
>> 
>> I appreciate your willingness to share.  It helps me be less ashamed of
my
>> carelessness.
>> 
>> Best,
>> David
>> 
>> 
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> 
> 
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