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who can measure the acceleration of gravity in frhd

Discussion in 'Anything and everything Free Rider' started by SegmentTree, Aug 10, 2022.

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  1. SegmentTree

    SegmentTree Casual Member Official Author

    there is air friction in frhd, so idk how to do
     
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  2. SilentFinger

    SilentFinger I have 3 featured tracks Elite Author Official Author

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    better question, why do you need to know
     
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  3. robbieraysfan

    robbieraysfan Well-Known Member Official Author

    its not that deep bro
     
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  4. Fluoride

    Fluoride Well-Known Member Official Author

    RedOrBlue I'm pretty sure he measured the acceleration while falling
     
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  5. FIREBEATS

    FIREBEATS FRHD Member of 2020 Team Helicopter Official Author

    Why?.....
     
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  6. SegmentTree

    SegmentTree Casual Member Official Author

    what's the number of the acceleration
     
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  7. SegmentTree

    SegmentTree Casual Member Official Author

    I'm bored
     
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  8. SegmentTree

    SegmentTree Casual Member Official Author

    and how did he do it
     
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  9. RedOrBlue

    RedOrBlue Forum Legend Ghosting Legend Team Blob Official Author

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    upload_2022-8-11_21-37-0.png
    this is the formula to determine the velocity of a free-falling biker, given t in seconds

    upload_2022-8-11_21-40-24.png
    velocity is measured in units per second where 1 unit is equivalent to one small grid box

    i just approximated a formula that would fit with what i found from testing over 2 years ago (https://pastebin.com/ehacacpT)
     

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  10. Polygon

    Polygon Well-Known Member Official Author

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    From the game code, you accelerate at a rate of 0.03 grid units per tick^2. There are 60 ticks er second, so do the math and the acceleration is exactly 108 grid units per second^2. (There are only 30 frames per second, but two ticks happen each frame unless you're in slow motion)

    Every tick, your velocity is multiplied by 0.99 for the air resistance, so every frame it's multiplied by 0.99^2 = 0.9801, which is super close to RedOrBlue's 0.98.
    Here's the exact formula for the bike's velocity over time as it falls (assuming I didn't mess up the math):
    [​IMG]
     
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  11. RedOrBlue

    RedOrBlue Forum Legend Ghosting Legend Team Blob Official Author

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    178.2 is the actual value for terminal velocity? huh cool
     
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  12. Ness

    Ness Guest

  13. cmLd

    cmLd Active Member Team Helicopter Official Author

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  14. TPlacella

    TPlacella Super Moderator on the FRHD speedrun.com page Team Helicopter Official Author

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    Last edited: Oct 9, 2024
    Cerasium likes this.

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