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Weighing a large person

George Harris
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Joined: May 05, 2003
Posts: 84
Assume that you have a person that is over 300 lbs. You have two scales that have a max weight of 250 lbs. Is it possible to determine the persons weight by having them stand with one foot on each scale, and if so, what is the formula for determining the weight.
Ryan McGuire
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Joined: Feb 18, 2005
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    3
Originally posted by George Harris:
Assume that you have a person that is over 300 lbs. You have two scales that have a max weight of 250 lbs. Is it possible to determine the persons weight by having them stand with one foot on each scale, and if so, what is the formula for determining the weight.


Add the weights together.
Bear Bibeault
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Joined: Jan 10, 2002
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  66

Buy better scales.


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Eric Pascarello
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Joined: Nov 08, 2001
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    6
truck scales always work well
David O'Meara
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Joined: Mar 06, 2001
Posts: 13459

Engineering Free Body - assuming a static system (the person isn't swaying or jumping up and down) then the sum of the forces in the system are zero, so the scales exert enough force to counter the weight of the person. There fore the weight is the sum of the values on the scales assuming one of the scales isn't 'maxed out'.
George Harris
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Joined: May 05, 2003
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Does it matter if the scales are placed further apart so that the persons legs are spread wide thus making them something like a suspension bridge were there is both forces in the X and Y directions?
Dave Lenton
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Joined: Jan 20, 2005
Posts: 1241
Originally posted by George Harris:
Does it matter if the scales are placed further apart so that the persons legs are spread wide thus making them something like a suspension bridge were there is both forces in the X and Y directions?

Yeah, because if the large person isn't humiliated enough to have to stand on two scales, making them stand in a funny way would do the trick.

BTW I'm assuming that "300 lbs" is a lot, I've got no idea. What's that in kilos? Or more usefully, how many small elephants is that?

[ June 23, 2006: Message edited by: Dave Lenton ]
[ June 23, 2006: Message edited by: Bear Bibeault ]

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David O'Meara
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Joined: Mar 06, 2001
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300 lbs is the same as 300 1lb bags of flour which is um...

Look, a liter of water weighs one kilo and is also 10cmx10cmx10cm. At the risk of turning this into a metric debate, what is a pound?
David O'Meara
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Joined: Mar 06, 2001
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Originally posted by George Harris:
Does it matter if the scales are placed further apart so that the persons legs are spread wide thus making them something like a suspension bridge were there is both forces in the X and Y directions?


Nope, in a static system the horizontal forces must cancel, as must the vertical. The weight of the individual is cancelled by the force exerted back by the floor and measured by the scale, and the horizontal force on one scale is cancelled by the force on the other. This assumes that applying a shear force (ie horizontal) to the scale doesn't affect the reading. That would depend in how the scale was made.
fred rosenberger
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Joined: Oct 02, 2003
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  16

technically, since a pound is a unit of force, and a Kg is a unit of mass, there is no direct conversion. you can't convert feet to liters, afterall.

a pound is equal to 4.44 newtons, and newton is the force needed to accelerate 1kg at 1m/sec/sec...

but at sea level, 1 lb is about 0.45 kg, so 300lbs is roughly 135 kg.


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Ernest Friedman-Hill
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  34

300 lbs == 21 stone.


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Ashok Mash
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Joined: Oct 13, 2000
Posts: 1936
Originally posted by Ernest Friedman-Hill:
300 lbs == 21 stone.


And a stone is what, 100 pebbles?


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Jim Yingst
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Joined: Jan 30, 2000
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[fred]: technically, since a pound is a unit of force, and a Kg is a unit of mass, there is no direct conversion.

Depends who you ask. I trust NIST. Wikipedia expound on this. When forced to use English units for some reason, it's easy enough to just say lbm or lbf depending which one you mean, and use F = ma/g<sub>c</sub>. Of you can talk about slugs, or poundals. But most people will more readily understand pounds force and pounds mass, I think.

[EFH]: 300 lbs == 21 stone.

21 stone 6, I believe.

[Ashok]: And a stone is what, 100 pebbles?

A stone is 14 pounds, 224 ounces, 3584 drams, or 98000 grains. Take your pick.
[ June 23, 2006: Message edited by: Jim Yingst ]

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Bear Bibeault
Author and ninkuma
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  66

I know a lot of football-build type of guys who weigh in at well over 300 lbs and don't have an ounce of fat on them... so let's keep to the adjective "large".

Me? I'm fat.
Bert Bates
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Joined: Oct 14, 2002
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    5
A pint's a pound the world around...

So that makes these 300 pounders about 37.5 gallons...


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Paul Clapham
Bartender

Joined: Oct 14, 2005
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    8

Originally posted by Bert Bates:
A pint's a pound the world around...
Or as Wikipedia says about the pint:
It is in use mainly in the U.S., the UK and Ireland, although the value is not the same and the U.S. has two types of pint...

[ June 28, 2006: Message edited by: Paul Clapham ]
Aj Mathia
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Joined: Apr 11, 2003
Posts: 478
Originally posted by George Harris:
Assume that you have a person that is over 300 lbs. You have two scales that have a max weight of 250 lbs. Is it possible to determine the persons weight by having them stand with one foot on each scale, and if so, what is the formula for determining the weight.


aah just chop em up and weigh using the two scales


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David O'Meara
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Joined: Mar 06, 2001
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There may be laws about that, but I would have to check.
Bert Bates
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Sheriff

Joined: Oct 14, 2002
Posts: 8815
    
    5
oh, oh, oh, i know!
stack one scale on top of the other - then put the 300 lb. guy on top...

the top scale will max out at 250, and the bottom one will pick up the additional 50!

sa-weet!
paul wheaton
Trailboss

Joined: Dec 14, 1998
Posts: 20572
    ∞

Two scales will work.

I weigh 300 pounds. But I just make sure that I get scales that go up to 350.

I used to drive wheat truck. And we used old scales to calculate how much wheat we brought in. The scale was designed for much smaller (older) trucks. So we would drive on the front axel, weight that, and then drive on the back axel and weigh that. We would do this with a full load and with an empty truck. I think this worked only because the ground was level and the truck was stiff - in other words, I don't think it would work with a person and one scale.


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Ben Souther
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Posts: 13410

State police use multiple scales when weighing trucks at impromptu weigh stations.


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