LK
Terracotta Army
Posts: 4268
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Having Mr. Wizard flashbacks.
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"Then there's the double-barreled shotgun from Doom 2 - no-one within your entire household could be of any doubt that it's been fired because it sounds like God slamming a door on his fingers." - Yahtzee Croshaw
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Mrbloodworth
Terracotta Army
Posts: 15148
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You say that like I didn't know this Chimpy.
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Khaldun
Terracotta Army
Posts: 15165
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Having Mr. Wizard flashbacks.
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Bzalthek
Terracotta Army
Posts: 3110
"Use the Soy Sauce, Luke!" WHOM, ZASH, CLISH CLASH! "Umeboshi Kenobi!! NOOO!!!"
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It's an optical illusion. The both ends of the slinky are contracting towards the center, the center is falling as per normal. It appears to us that the bottom remains still while the top falls twice as fast as normal.
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"Pity hurricanes aren't actually caused by gays; I would take a shot in the mouth right now if it meant wiping out these chucklefucks." ~WayAbvPar
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Count Nerfedalot
Terracotta Army
Posts: 1041
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It's an optical illusion. The both ends of the slinky are contracting towards the center, the center is falling as per normal. It appears to us that the bottom remains still while the top falls twice as fast as normal.
What do you mean "it appears that"? Unless there is some really weird perspective stuff going on, the bottom pretty much IS remaining still. So the question becomes, is it a coincidence that the force of the spring pulling up on the bottom is exactly equal to the force of gravity pulling down, or is there something else going on? Would the bottom behave the same if the spring was twice (or half) as strong? Also, what would happen if the slinky was long enough (say 10 or 20 miles or so) for there to be a noticeable difference between the force of gravity acting on the bottom vs the top. Would the bottom still stay suspended until the top contracted down to it? |
Yes, I know I'm paranoid, but am I paranoid enough?
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Bzalthek
Terracotta Army
Posts: 3110
"Use the Soy Sauce, Luke!" WHOM, ZASH, CLISH CLASH! "Umeboshi Kenobi!! NOOO!!!"
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It's mostly coincidence, but I say "appears" because there is obviously going to be some change of elevation of the bottom of the slinky, but it's marginal from our vantage point and the quality of the video.
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"Pity hurricanes aren't actually caused by gays; I would take a shot in the mouth right now if it meant wiping out these chucklefucks." ~WayAbvPar
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ajax34i
Terracotta Army
Posts: 2527
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Not just the bottom of the slinky that's at rest; just as he lets go, the middle of the slinky is at rest too. When he's holding it, for each coil in the slinky, gravity is balanced by the elastic force from the coil above pulling up. When the top is released, the motion propagates like a wave, with slow speed rather than infinite speed. In effect, none of the lower coils realize the slinky has been released until the motion reaches them and the elastic force disappears.
Wave propagation.
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rk47
Terracotta Army
Posts: 6236
The Patron Saint of Radicalthons
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don't know about portal
what am i missing?
Answered your own question you have, hmm Sure. Nahhhhhhh. Hate puzzle games.  |
Colonel Sanders is back in my wallet
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Goumindong
Terracotta Army
Posts: 4297
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In effect, none of the lower coils realize the slinky has been released until the motion reaches them and the elastic force disappears.
Wave propagation.
The "center mass is falling" explanation is better than the wave propagation method i think. http://www.wired.com/wiredscience/2011/09/modeling-a-falling-slinky/The "middle" of the slinky is only at rest because the center of mass of the slinky is not the middle after the instant it has been dropped, the center of mass is falling. |
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Lakov_Sanite
Terracotta Army
Posts: 7590
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Fuckin' slinkies, how do they work?  |
~a horrific, dark simulacrum that glares balefully at us, with evil intent.
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tazelbain
Terracotta Army
Posts: 6603
tazelbain
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Fuckin' slinkies, how do they work? Read your bible, sinner! |
"Me am play gods"
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01101010
Terracotta Army
Posts: 12003
You call it an accident. I call it justice.
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Does any one know where the love of God goes...When the waves turn the minutes to hours? -G. Lightfoot
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MuffinMan
Terracotta Army
Posts: 1789
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The beginning theme to Civ IV plays in my head while watching that gif.
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I'm very mysterious when I'm inside you.
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Lantyssa
Terracotta Army
Posts: 20848
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It's center-of-mass.
The spring is stretched to the extent that its force is equal to gravity. The center of mass moves, so it contracts slightly in the lower half, but not enough to really notice easily. Because gravity was matching the stretch of the spring, the very lowest point remains stationary until the spring is fully collapsed. The top of the spring is accelerating at twice the rate of gravity. The center of mass falls at G.
Simplify it to three points: Top, T. Bottom, B. And Center, C.
T = 9.8 m/s^2 + 9.8 m/s^2
B = 9.8 m/s^2 - 9.8 m/s^2
C = (T + B) / 2 = 9.8 m/s^2, which is the rate the mass as a whole is falling at. You cannot make the entire mass fall any slower or faster without outside force.
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Hahahaha! I'm really good at this!
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apocrypha
Terracotta Army
Posts: 6711
Planes? Shit, I'm terrified to get in my car now!
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Hmm... the gif is too fast. You miss the lightning in the clouds unless you're looking for it. But the YouTube vid is a bit jerky... needs something that goes a bit faster than the YouTube vid (but not much) but with more frames, so it's smoother. Then it'd be really, really awesome. |
"Bourgeois society stands at the crossroads, either transition to socialism or regression into barbarism" - Rosa Luxemburg, 1915.
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MuffinMan
Terracotta Army
Posts: 1789
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There are different versions on youtube where people have smoothed it out.
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I'm very mysterious when I'm inside you.
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apocrypha
Terracotta Army
Posts: 6711
Planes? Shit, I'm terrified to get in my car now!
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"Bourgeois society stands at the crossroads, either transition to socialism or regression into barbarism" - Rosa Luxemburg, 1915.
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K9
Terracotta Army
Posts: 7441
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Nicely found, thanks
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I love the smell of facepalm in the morning
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K9
Terracotta Army
Posts: 7441
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I love the smell of facepalm in the morning
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Cyrrex
Terracotta Army
Posts: 10603
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Woah! So weird!
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"...maybe if you cleaned the piss out of the sunny d bottles under your desks and returned em, you could upgrade you vid cards, fucken lusers.." - Grunk
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Der Helm
Terracotta Army
Posts: 4025
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"I've been done enough around here..."- Signe
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tazelbain
Terracotta Army
Posts: 6603
tazelbain
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T1000s are excellent swimmers.
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"Me am play gods"
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apocrypha
Terracotta Army
Posts: 6711
Planes? Shit, I'm terrified to get in my car now!
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"Bourgeois society stands at the crossroads, either transition to socialism or regression into barbarism" - Rosa Luxemburg, 1915.
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Lantyssa
Terracotta Army
Posts: 20848
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Very nice.
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Hahahaha! I'm really good at this!
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01101010
Terracotta Army
Posts: 12003
You call it an accident. I call it justice.
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Does any one know where the love of God goes...When the waves turn the minutes to hours? -G. Lightfoot
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MuffinMan
Terracotta Army
Posts: 1789
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The picture of Andre.  |
I'm very mysterious when I'm inside you.
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01101010
Terracotta Army
Posts: 12003
You call it an accident. I call it justice.
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The picture of Andre. And Peter... /cry edit: No Fred Savage? I doubt he has much pressing these days to miss the opportunity. |
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« Last Edit: October 10, 2011, 05:36:15 PM by 01101010 »
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Does any one know where the love of God goes...When the waves turn the minutes to hours? -G. Lightfoot
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Teleku
Terracotta Army
Posts: 10510
https://i.imgur.com/mcj5kz7.png
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The ROUS hitting the snack table is the best part.  |
"My great-grandfather did not travel across four thousand miles of the Atlantic Ocean to see this nation overrun by immigrants. He did it because he killed a man back in Ireland. That's the rumor."
-Stephen Colbert
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stu
Terracotta Army
Posts: 1891
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Believe it or not, Fred Savage directs some classic tv these days.
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Dear Diary,
Jackpot!
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DraconianOne
Terracotta Army
Posts: 2905
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It's also missing William Goldman and Rob Reiner but I guess the writer and director aren't really that important.
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A point can be MOOT. MUTE is more along the lines of what you should be. - WayAbvPar
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HaemishM
Staff Emeritus
Posts: 42633
the Confederate flag underneath the stone in my class ring
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Believe it or not, Fred Savage directs some classic tv these days.
He's actually directed some episodes of It's Always Sunny in Philadelphia. |
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Nebu
Terracotta Army
Posts: 17613
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Who is the guy with the sword in the background? I've watched this movie literally hundreds of times and I have no idea who that is. Is it Prince Humperdinck?
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"Always do what is right. It will gratify half of mankind and astound the other."
- Mark Twain
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01101010
Terracotta Army
Posts: 12003
You call it an accident. I call it justice.
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Who is the guy with the sword in the background? I've watched this movie literally hundreds of times and I have no idea who that is. Is it Prince Humperdinck?
Indeed... guy near the horse is Count Rugen. |
Does any one know where the love of God goes...When the waves turn the minutes to hours? -G. Lightfoot
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Merusk
Terracotta Army
Posts: 27449
Badge Whore
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Who is the guy with the sword in the background? I've watched this movie literally hundreds of times and I have no idea who that is. Is it Prince Humperdinck?
Indeed... guy near the horse is Count Rugen. The photographer has it all mixed up. The 'guy with the sword' should be the Count seeing as it is the sword Inigo's father made. grr! /nerdpick |
The past cannot be changed. The future is yet within your power.
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Author
. - schild
