# oranges and drywall

by claegreid
Tags: bar physics, drywall, orange, oranges, wtfbbq
 P: 3 OK, PF, I have an argument to settle and I need some expert advice. A friend of mine claims that it is possible to throw an orange through a 1/2" sheet of drywall (gypsum board); several other friends refute his claim. I would like to do the math to prove/disprove the theory, but my line of work doesn't give me a lot of practice with the physics of such dynamic elements. Question to the forum: how would I go about setting up an equation solve for this problem. Thanks in advance!
 P: 833 Why don't you just give it a try?
P: 3
 Quote by Khashishi Why don't you just give it a try?
That's the next step. But if I find out how much force is necessary and it is more than a human arm can supply, then I will have to build a cannon of sorts to achieve what man cannot.

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## oranges and drywall

 Quote by claegreid OK, PF, I have an argument to settle and I need some expert advice. A friend of mine claims that it is possible to throw an orange through a 1/2" sheet of drywall (gypsum board); several other friends refute his claim. I would like to do the math to prove/disprove the theory, but my line of work doesn't give me a lot of practice with the physics of such dynamic elements. Question to the forum: how would I go about setting up an equation solve for this problem. Thanks in advance!
1/2" drywall is not very strong. Especially if you freeze the orange first...
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P: 6,379
 Quote by berkeman Especially if you freeze the orange first...
And don't forget that if a baseball pitcher or a cricket fast bowler did the experiment, the orange would hit the drywall traveling at more than 90 mph.
 P: 2,861 Perhaps google for the impact properties of drywall. If you can't find them you will have to do the experiment.
 Sci Advisor PF Gold P: 11,380 Don't try this at home, folks!
P: 54
 Quote by claegreid That's the next step. But if I find out how much force is necessary and it is more than a human arm can supply, then I will have to build a cannon of sorts to achieve what man cannot.
Uh, this seems to be outside the conditions of the OP... ? I refer to the word "throw"...
 P: 976 The question becomes one of whether the orange will fly apart from the acceleration or air turbulence before it gets enough momentum to break the drywall. http://www.gypsum.org/wp/wp-content/.../GA-235-10.pdf talks about drywall strength. I'd have to learn more about the methods used for measurement of Effective Modulus of Rupture (MOR) per ASTM C 1396 to understand how to apply the numbers. Are you considering a freestanding 4x8 sheet? or one nailed to 17" studs?
 P: 2,070 Only somewhat related, but I love this movie of a cannon firing a 2x4 through a brick wall. http://www.youtube.com/watch?v=Pot7UI5SLb8

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