Chair Slingshot

[Foxal1337]

3 people had this happen to them XD

[Foxal1337]

XD this was a Spite commercial in Europe

[TurntableJUNKIE]

Funny joke to play on your drunk friends.

[FARTinAsmallJAR]

wow



[gillybgoode]

So that guy is probably dead, or crippled... maybe a manslaugher charge, reckless endangerment etc... alot of charges here! There should even be a charge of stupidity and make those fools pay for the guys life support if his neck is broken.

[KiraCanFly]

Holy.

Crap.

Ouch.

[w0tth3b4l4ck4]

ouch was that fucking real what a dick head thing to do :D

[shakeandbake1997]

hahaha bet that hurt.

[MiniDudez]

Shut up nerd... Geesh..Just watch the goddamn movie and enjoy it.

[MiniDudez]

Shut up nerd... Geesh..Just watch the goddamn movie and enjoy it.

[Travelfun4ever]

Nerds who cares did he live to tell the story lol

[UncleAndy814]

ooo look at me im smart and can leave dick comments on a funny video

[toppPictures]

hahahahaha thats exactly what i would have said uncle andy...six pack is a bitch, and if he knows physics, he prob has no six pack

[tobyJ302]

no one realy gives a shit anout what you think and stop recking it for people who dont kno that it is fake you geek

[becketto]

@sixpack768 dude, no-one here actually gives a shit

[mkbarth]

#1

I don't see where this is faked.

But let's try a few numbers. Say the guy is shot about 15 ft vertically. Then, vy2 = vy02 + 2ay(y-y0) tells that his initial vertical velocity, vy0 , was about 32 ft/sec.

[CerenityT]

can someone translate this uber nerd?????

[mkbarth]

Yeah, CerenityT. Translation: Fake!

[mkbarth]

#2

And then vy = vy0 + ayt would make the time to apex at about 1 sec. Since the video shows about 2 sec to hit the ground again, that seems about right.

Then, say he lands about 100 ft away. So, vx = vx0 + axt would give us his horizontal velocity, vxo , at about 50 ft/sec.

[mkbarth]

#3

Using v02 = vx02 +vy02, we then get about 60 ft/sec for his initial velocity along his trajectory.

And sin-1 (vy0 / vx0) would make his take off angle about 38o. The video looks like that could be about right.

No problem so far.

[mkbarth]

#4

Let's say they pulled this guy back about 10 ft. Then, using d = d0 +1/2(v0 + v)t, he achieved his initial velocity of 60 ft/sec in only 1/3 sec. Uh-oh!

Using v = v0 + at , his acceleration is 180 ft/sec2 or almost 6 g's. AAAAH!

[mkbarth]

#5

Well, the video doesn't imply that he survived the 6 g launch in a lawn chair with no pressure suit, helmet or body restraint. Nor does it show him getting up after hitting the ground at 40 mph. So, fatal maybe, but so far no laws of physics are violated.

But wait.

[mkbarth]

#6

Let's say the guy weighs about 180 lb. Then, F = ma tells us that the average force to accelerate him 180 ft/sec2 is over 1000 lb. And since the slingshot's tension would be linearly changing with elongation, the maximum force when stretched all the way would be 2x this average.

[mkbarth]

#7

So, his two friends would have to pull him back with over 2000 lb of pull. Yikes! But, even if they were very strong, they're pulling horizontally, just standing on the ground. They're wearing tennis shoes, so let's approximate that as comparable to the rubber on car tires.

[becketto]

@mkbarth Umm no-one actually gives a shit about everything you have just said

[mkbarth]

#8

From Mark's Handbook for MEs, it would be generous to assume their coefficient of friction with the ground is u = 0.7. Then, using f = uN, their combined weight would have to be over 2800 lb. I'm starting to having a problem with this.

[mkbarth]

#9

What if they were weighted down? His two friends would each have to have a cubic foot of Iridium, at 1383 lb/ft3, in their pockets. Now, I don't think so.

Oh wait, I get it. It's funny.

[gymnastx77]

wait..how is that fake?

explain.. please :]

[gymnastx77]

wait...how is it fake? can someone explain that...???

[VXxXAzzAXxXV]

fake

[NoobKing65]

LMFAO

[nothing192]

lol awesome though its fake

[RedBull3220]

ya right!! HAHA! fake.

[bigdaddy9666]

rofl. nice

[broccolibloom]

ha ha ha ha ha. liked the car alarm going off aswell.

[HeadDominion]

looks fake

[puppetdesign]

gee...ya think?

[RustySporks]

LOL that's wickedly hilarious!