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

David Engebretson Jr. davide at soundandscience.com
Mon Dec 19 09:40:54 CST 2011


Sorry Ken, I can't help but giggle about that one...

Assuming your weight of 180 is evenly distributed throughout your height... 
what is your height?  It must be some sort of parametric equation in your 
case since the force was probably absorbed from three feet up to your actual 
height.

I think it would be too difficult to compute if you tried to assume your 
head was such and such a weight, your midsection was such and such a weight, 
and your legs and cane that continued forward as the rest of you stopped, 
was flying forward before you splat on your bum.

I'm sure this can all be described with vectors... I just don't remember how 
to do it accurately.

Best,
D



David Engebretson
Support at PeaceWeaverHosting.com - "We know what our name means"
----- 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 6:31 AM
Subject: Re: [Blindmath] physics/mathematics problem; have a solution?


>
> 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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