# Naked Science Forum

## On the Lighter Side => New Theories => Topic started by: tony6789 on 09/02/2007 18:03:38

Title: My theory of string V.S. weight
Post by: tony6789 on 09/02/2007 18:03:38
If u tied a string to a house celing and on the other end woud b 1 thousand pounds wat wud happen?...my theory is that the celing wub fall b4 the string broke
Title: My theory of string V.S. weight
Post by: Hadrian on 09/02/2007 18:06:50

you get a big hole in the floor of course [^] [^] [^]

Title: My theory of string V.S. weight
Post by: tony6789 on 09/02/2007 18:11:30
well yea no kidding man
Title: My theory of string V.S. weight
Post by: Hadrian on 09/02/2007 18:16:45
well yea no kidding man

LOL  [:)]
Title: My theory of string V.S. weight
Post by: Hadrian on 09/02/2007 18:45:33
You get a lot of complaints from the neighbours too  [;D]
Title: My theory of string V.S. weight
Post by: lightarrow on 10/02/2007 00:06:18
If u tied a string to a house celing and on the other end woud b 1 thousand pounds wat wud happen?...my theory is that the celing wub fall b4 the string broke
Sorry but I don't understand how are the string and the weight put. Can you explain better?
Title: My theory of string V.S. weight
Post by: tony6789 on 16/02/2007 18:12:09
its like ( imagine) u have a string tied to the celing stright up and down so that the other end of the string is pointing twards the floor. and at the other end of the string is a thousand pound wieght...im saying that the celing wud break b4 the string wud (or the knonts)
Title: My theory of string V.S. weight
Post by: neilep on 16/02/2007 18:50:45
I think this might depend on how well fixed th string is to the weight and how well fixed the other end of the string is attached to the ceiling.

Assuming the string was fixed so that it is very sturdy and you then lifted the weight up a little way and then dropped it..I think the string would break  first

[diagram=163_0]

LOL...what a crap picture !

Having said all this ...it really also depends on the strength of the string but me reckons Tony if it's your bog standard string then I think it will fail first !!

If the string was like....well strong....then you can say hello to a hole in the ceiling and a crater in your floor  if the weight was lifted and dropped !!

OK...it will also depend on the strength of the ceiling etc etc etc....
Title: My theory of string V.S. weight
Post by: another_someone on 16/02/2007 19:14:23
its like ( imagine) u have a string tied to the celing stright up and down so that the other end of the string is pointing twards the floor. and at the other end of the string is a thousand pound wieght...im saying that the celing wud break b4 the string wud (or the knonts)

Does that not depend on the design of the string, and the construction of the ceiling (and maybe even the construction of the weight - after all, don't forget that the weight itself might fall appart, unable to take its own weight).

Most ceilings in domestic dwellings are just a thin plasterboard that is not meant to take any weight, but the joists above are meant to take the weight of the floor above the ceiling, and it is to those that you would normally attach anything of any weight.

Ofcourse, it also depends on how widely you spread the weight.  A 1000 lb weight, spread over 100 square feet, is only 10 pounds/square foot, but if you connect that the weight to the ceiling at a point that is 1/10th of an inch squared (1/14400th of a square foot in area) then the 1000 lb weight produces a force of 14.4 million pounds to the square foot at the point of contact.
Title: My theory of string V.S. weight
Post by: tony6789 on 30/03/2007 16:49:00
ok..umm idk how to explain this....say its just an average string u find lie around...and u have the smart idea of seeing which will break first the string or your(normal house..average celing) celing if u were to tie the other end of the string to the wight...evenly distributed on the wieght.  the wieght looks like the kinda wieght ud see on cartoons like an anvil thing if thats wat ud call it. I argue that the celing wud break first becasue of all the wieght that the thousand pound wieght is getting from the gravity pressure on it.

The string wud stay intact because its not being ripped apart..its being pulled so that makes it harder for the string to break. More to my side is that celings aren't ment to hold more wieght than they are built to hold...if u add more it will crumble and break.
So HA! lets see some1 swallow that..beaten by a 14 yr old..lol
Title: My theory of string V.S. weight
Post by: another_someone on 31/03/2007 06:11:06
You still have not told me how you attach the string to the ceiling?

As I said above, the plasterboard that provides the visible face of the ceiling is very week (as shown by the number of people who, when working in their attic, if the attic has no flooring on it, and if they are not careful enough about only stepping on the load bearing joists, can easily put their foot straight through the plasterboard of the ceiling of the room beneath).
Title: My theory of string V.S. weight
Post by: DoctorBeaver on 31/03/2007 12:16:47
It would depend whether the thousand pounds was paper money or coins  [:D]
Title: My theory of string V.S. weight
Post by: tony6789 on 02/04/2007 16:44:36
umm u tie it? lol that is not part of the experiment...tho
Title: My theory of string V.S. weight
Post by: science_guy on 03/04/2007 15:47:56
Quote
It would depend whether the thousand pounds was paper money or coins

Im glad I know what you mean by pounds, or I wouldn't get that joke.

Can I have a thousand pounds?
Title: My theory of string V.S. weight
Post by: tony6789 on 03/04/2007 16:41:26
lol meatal pounds
Title: My theory of string V.S. weight
Post by: another_someone on 03/04/2007 20:55:36
umm u tie it? lol that is not part of the experiment...tho

Tie it to what?

The only thing one can reasonably tie a piece of string to is the joists, but the joists are load bearing structures - which is why it is important to know how it is attached, because that will effect where it is attached (whether to a load bearing component of the building, or just a facade).
Title: My theory of string V.S. weight
Post by: tony6789 on 04/04/2007 16:28:57
a hook ..omg lol
Title: My theory of string V.S. weight
Post by: Ben6789 on 04/04/2007 16:30:47
I think you would need a fast frame camera to see the roof break before the string because they it would seem to our eye that they would break at the same time.
Title: My theory of string V.S. weight
Post by: tony6789 on 04/04/2007 16:35:24
yea i can visualize that but if the celing breaks it breaks....if the string breaks it breaks so no u dont need one
Title: My theory of string V.S. weight
Post by: tony6789 on 04/04/2007 16:38:42
no nvm u wudn need 1 man
Title: My theory of string V.S. weight
Post by: tony6789 on 04/04/2007 16:39:10
wtf where is my signature? NIEL!!!!!! FIX IT!!!! grrrr
Title: My theory of string V.S. weight
Post by: Ben6789 on 04/04/2007 20:03:01
Keep to the subject, and give Neil some time. Patience is a virtue.
Title: My theory of string V.S. weight
Post by: Ben6789 on 10/04/2007 16:32:10
yea i can visualize that but if the celing breaks it breaks....if the string breaks it breaks so no u dont need one--tony6789

Huh?
Title: My theory of string V.S. weight
Post by: another_someone on 10/04/2007 16:45:48
a hook ..omg lol

And what will the hook hook on to (the cieling is a flat surface)?  What shape and size is the hook?
Title: My theory of string V.S. weight
Post by: Ben6789 on 11/04/2007 13:06:49
There are too many variables that tony6789 is not being specific enough about. If I had more info to get rid of the hundreds of variables...maybe I could find out..with the help of my physics genius brother Don.
Title: My theory of string V.S. weight
Post by: tony6789 on 11/04/2007 13:58:42
wat kinda variables?
Title: My theory of string V.S. weight
Post by: paul.fr on 11/04/2007 14:04:31
wat kinda variables?

peas, carrots..oh variables
Title: My theory of string V.S. weight
Post by: Ben6789 on 11/04/2007 16:40:13
wat kinda variables?

peas, carrots..oh variables

I don't get it...

wat kinda variables?

What type of string? What kind of ceiling? Is the ceiling slanted? What shape is the weight? Box? Cylindrical?