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avantgame's profile
Jane McGonigal
Jane McGonigal
Jane McGonigal
Verified account
@avantgame

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Jane McGonigalVerified account

@avantgame

*The opposite of play isn't work. It's depression.* Get my latest NYT bestseller SUPERBETTER! (it's powered by the science of games.) http://amzn.to/1OmREc0 

San Francisco-ish
janemcgonigal.com
Joined January 2007

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    Jane McGonigal‏Verified account @avantgame Jan 4

    Geeky science question for anyone who might be well informed on the topic of gravity and gravity-free movement. Please see the image for details and tell me how fast/far off the ground I would move in 3 seconds of zero gravity...pic.twitter.com/Tv4sS8Ghm4

    6:04 PM - 4 Jan 2018
    • 3 Retweets
    • 5 Likes
    • Stephanie Sakoda Mair Dundon Steve daphne mir Brian Crew Jacob Lambert Justin Schleider Justin Lanier
    15 replies 3 retweets 5 likes
      1. New conversation
      2. Justin Lanier‏ @j_lanier Jan 4
        Replying to @avantgame

        It seems like it would depend on the elasticity of the surface you were standing on. Like, if you were standing on a trampoline, then you’d be shot up once gravity turned off. (Equal, opposite, unbalanced force.) But everything’s a trampoline—just a pretty poor one.

        1 reply 1 retweet 4 likes
      3. Evan Daniel‏ @evanbd Jan 4
        Replying to @j_lanier @avantgame

        Exactly. Rubber shoe soles will spring back more than wood or metal furniture.

        1 reply 0 retweets 1 like
      4. Evan Daniel‏ @evanbd Jan 4
        Replying to @evanbd @j_lanier @avantgame

        If you measure how much the thing (eg shoe sole) squishes, you can get a good estimate. Assume it's a perfect spring (probably close, for ordinary stuff at ordinary loads). Spring energy: 1/2*f*d. Kinetic energy: 1/2*m*v^2.

        1 reply 0 retweets 1 like
      5. Evan Daniel‏ @evanbd Jan 4
        Replying to @evanbd @j_lanier @avantgame

        f=m*g. Substitute, cancel: m*g*d = m*v^2. (d is displacement of squished thing.) Gives v = sqrt(g*d). So if your show squishes by 1mm (reasonable? IDK), 1 gravity gets you about 0.1 m/s of velocity after you turn off gravity.

        2 replies 0 retweets 2 likes
      6. Evan Daniel‏ @evanbd Jan 4
        Replying to @evanbd @j_lanier @avantgame

        And it will take about 0.01s for your shoe to unsquish and accelerate you in this scenario. If it takes an appreciable fraction of that time (or longer) to "turn off" gravity, you won't rise up as quickly.

        0 replies 0 retweets 1 like
      7. End of conversation
      1. New conversation
      2. Ariel Waldman‏Verified account @arielwaldman Jan 4
        Replying to @avantgame

        Depends on your environment/container and scenario and even type of artificial gravity (and how it “fails”). But in a general sense you can watch people go instantly into “Zero G” on Zero G flight videos (aka vomit comet) which you can ask @tim846 about...

        1 reply 0 retweets 3 likes
      3. Ariel Waldman‏Verified account @arielwaldman Jan 4
        Replying to @arielwaldman @avantgame

        But to go more into the precise physics, I’d hit up physicists @HakeemOluseyi @AstroKatie @seanmcarroll off the top of my head.

        1 reply 0 retweets 2 likes
      4. Hakeem Oluseyi‏Verified account @HakeemOluseyi Jan 4
        Replying to @arielwaldman @avantgame and

        Great question. I prefer to lead people to answers rather than just give an answer. Assume 2 spheres in contact w/ no forces acting between them, no external forces, no relative motion. They'd stay that way forever, right? Now turn on and off an attractive force. What happens?

        0 replies 0 retweets 2 likes
      5. End of conversation
      1. New conversation
      2. Paul Mugan‏ @Paul_Mugan Jan 4
        Replying to @avantgame

        Please understand that if a little knowledge is dangerous then my response should make you shriek with fear. However, unless inertia is turned off as magically as the gravity in this experiment, there would be no immediate effect. Rebuttal?

        1 reply 1 retweet 3 likes
      3. 1 more reply
      1. Darren Grey‏ @dgrey0 Jan 5
        Replying to @avantgame

        Nothing much would happen beyond a vague floaty feeling until something new happened to you. Imagine attaching a piece of metal to an electromagnet in space, then turning the magnet off. They'd stay floating together unless you pushed them apart.

        0 replies 0 retweets 1 like
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      1. 3DP Professor‏ @3DPProfessor Jan 4
        Replying to @avantgame

        When you're talking simulated gravity, you mean the Einstein thought experiment about accelerating in a rocket? On which case I think the answer is clear.

        0 replies 0 retweets 1 like
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      1. Leoparddrengen‏ @Leoparddrengen Jan 4
        Replying to @avantgame

        Things wouldn't start to float away by themselves. Something would need to happen to give objects momentum relative to each other.

        0 replies 0 retweets 1 like
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      1. Chris Booth‏ @chatbotbooth Jan 5
        Replying to @avantgame

        I read about this question then other day; it's a fun read:http://www.bbc.co.uk/earth/story/20160212-what-would-happen-to-you-if-gravity-stopped-working …

        0 replies 0 retweets 0 likes
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      1. Twopenniesworth‏ @TommySmo Jan 5
        Replying to @avantgame

        Check the XKCD What If? archives

        0 replies 0 retweets 0 likes
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      1. New conversation
      2. Rafael Willian‏ @raf_will Jan 5
        Replying to @avantgame

        Consider a basketball player on Earth, in rest relative to the ground. Suddenly the gravity disappears and he/she decides to jump. How far could they go? Infinite (Newton's First Law of motion). How fast? After the jump, they would be at 5,5m/s (12mi/h), neglecting air friction.

        1 reply 0 retweets 0 likes
      3. Rafael Willian‏ @raf_will Jan 5
        Replying to @raf_will @avantgame

        At what speed would things start to float up? If no external force, they would stay in the same initial condition. In fact, this "controlled environment" happens during every single rocket launch with the difference that astronauts experience higher values of G.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Funky Visions‏ @FunkyVisions Jan 4
        Replying to @avantgame

        My game in the App Store called Jiggle Balls can test this for you. You can see what happens when you remove gravity from different bounciness of balls. The ones with no bounce will stay stationary. Those with bounce will release some energy and propel when gravity is reduced.

        1 reply 0 retweets 0 likes
      3. Funky Visions‏ @FunkyVisions Jan 4
        Replying to @FunkyVisions @avantgame

        The blue ball has no bounce. The white does. It floats when gravity is reduced. The white ball stays put.pic.twitter.com/zLeB7B9q1T

        1 reply 0 retweets 0 likes
      4. Funky Visions‏ @FunkyVisions Jan 4
        Replying to @FunkyVisions @avantgame

        I mean the blue stays put.

        0 replies 0 retweets 0 likes
      5. End of conversation

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