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How to do this physics project.

CatchPhrase

Senior member
I have to make a structure out of toothpicks and glue that can hold up a 35 lb object.
I can't use strings or bunch them together.
What kind of design could work?
I am just looking for some ideas.
 
interesting...isn't this similar to that stunt where a person lays down on a bed of nails? equal distribution of the weight and such. *shrug*
 
Originally posted by: dbk
interesting...isn't this similar to that stunt where a person lays down on a bed of nails? equal distribution of the weight and such. *shrug*

Exactly, an object with a huge area and a large bed of toothpicks should be pretty easy. It would take quite a bit of time though
 
Originally posted by: dbk
interesting...isn't this similar to that stunt where a person lays down on a bed of nails? equal distribution of the weight and such. *shrug*

No it shows how the strength of many small things can hold up a heavy thing.

Edit: The nails do not break and skin does = showing weight distribution.

The object does not break and the toothpicks do = weight distribution.

They both have to do with the same principles but different area of focus.
 
throw a bunch of toothpicks in a shoebox
dump in a bunch of bottles of glue
leave it in a warm place for a few days
rip off the shoebox
put textbooks on the brick
 
Originally posted by: silverpig
throw a bunch of toothpicks in a shoebox
dump in a bunch of bottles of glue
leave it in a warm place for a few days
rip off the shoebox
put textbooks on the brick

LOL
 
Originally posted by: zinfamous
Originally posted by: CatchPhrase
Originally posted by: Jeff7
Triangles are your friend.

How many toothpicks can you use?

Unlimited toothpicks, I guess I have to use hot glue also.

ATOT has given you the answer.

now proceed with your cheating.

What a vague answer. We do not live in a 2D universe.
Anyone that has played Fantastic Contraption knows about Gods powerful shape.
http://fantasticcontraption.com
 
Originally posted by: silverpig
throw a bunch of toothpicks in a shoebox
dump in a bunch of bottles of glue
leave it in a warm place for a few days
rip off the shoebox
put textbooks on the brick

So you're an arts major? 😛
 
Check on that hot glue requirement. That stuff suuuuuucks for structural rigidity. Elmer's Wood Glue: Awesome.

And unlimited toothpicks? You could hold up a car.


I had a similar project in high school, except that we had popsicle sticks. There was a "limit" on the # of sticks we could use, but it was kind of flexible, and not really enforced. My group was one of the two groups in the class (out of around 10 groups total) that genuinely made an attempt to make something. I don't remember what it held, but it was well over 100lbs, across a span of at least 3 feet. We ran out of weights, so everyone started setting textbooks on the platform until the bridge catastrophically failed.

It was me and two other people working on it in just one weekend (and Friday afternoon). We constructed it in modules: Individual reinforced triangular sections, glued together with Elmer's Wood Glue, and then placed in front of a 1500W space heater to dry them faster.
It would have held more, but we ran out of time, and had to assemble the three large sections (2 sides and the roadbed) with hot glue on the morning of the test. It was quite impressive though. 😀


Originally posted by: silverpig
throw a bunch of toothpicks in a shoebox
dump in a bunch of bottles of glue
leave it in a warm place for a few days
rip off the shoebox
put textbooks on the brick
:laugh:
Me likey. Better yet, fill it with epoxy.
Then write up a report on the strengths and weaknesses of anisotropic composites. 😛
The appendix should include a note on the importance of carefully confining constraints on a problem.

 
Originally posted by: GodlessAstronomer
Originally posted by: silverpig
throw a bunch of toothpicks in a shoebox
dump in a bunch of bottles of glue
leave it in a warm place for a few days
rip off the shoebox
put textbooks on the brick

So you're an arts major? 😛

Or perhaps a genius. There's no point in limiting yourself with limitations that haven't been explicitly set out. 🙂
 
err, how high off of the ground does it have to be? Just make a flat plate of toothpicks. If that doesn't work, I'd be happy to show you how to do a stress analysis for truss members 🙂
 
Originally posted by: drinkmorejava
err, how high off of the ground does it have to be? Just make a flat plate of toothpicks. If that doesn't work, I'd be happy to show you how to do a stress analysis for truss members 🙂
Ugh, my class got to that stuff in ANSYS just a week or two ago. Old ANSYS makes babies cry. Workbench is soooo much nicer. Granted, it's not quite as capable as the old ANSYS, but I don't think that'll last more than a few years.


Cheaper option: Pontifex demo. 😉

Surprisingly, there are some videos of big bridges on Youtube.

 
Originally posted by: drinkmorejava
err, how high off of the ground does it have to be? Just make a flat plate of toothpicks. If that doesn't work, I'd be happy to show you how to do a stress analysis for truss members 🙂
5 to 6 inches
 
Originally posted by: Jeff7
Originally posted by: drinkmorejava
err, how high off of the ground does it have to be? Just make a flat plate of toothpicks. If that doesn't work, I'd be happy to show you how to do a stress analysis for truss members 🙂
Ugh, my class got to that stuff in ANSYS just a week or two ago. Old ANSYS makes babies cry. Workbench is soooo much nicer. Granted, it's not quite as capable as the old ANSYS, but I don't think that'll last more than a few years.


Cheaper option: Pontifex demo. 😉

Surprisingly, there are some videos of big bridges on Youtube.

haha, I was thinking more paper + pencil and mucho vectors.

pshh, Comsol and Matlab is where it's at. Course, I'm more aero than structural analysis. ANSYS makes fluent though doesn't it?
 
Originally posted by: drinkmorejava
haha, I was thinking more paper + pencil and mucho vectors.

pshh, Comsol and Matlab is where it's at. Course, I'm more aero than structural analysis. ANSYS makes fluent though doesn't it?
Makes fluent? As in, it makes it easier to do? Grammar no worky. 😉

 
Originally posted by: Jeff7
Originally posted by: drinkmorejava
haha, I was thinking more paper + pencil and mucho vectors.

pshh, Comsol and Matlab is where it's at. Course, I'm more aero than structural analysis. ANSYS makes fluent though doesn't it?
Makes fluent? As in, it makes it easier to do? Grammar no worky. 😉

Missed a few commas, but now you're confusing me.
FLUENT
 
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