How is kinetic energy calculated?

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This topic contains 11 replies, has 9 contributors, and was last updated by  djbowhunter 3 years, 10 months ago.

Viewing 12 posts - 1 through 12 (of 12 total)
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  • August 17, 2006 at 10:51 pm #495145 Back to Top REPORT
    symo
    Symo


    Joined: 6/29/2004
    Speaking of KE,,has anyone noticed a few articles in two different bow hunting mags. that have the KE formula at fps. fps. arrow weight then divide by 480,240.??Where did they get that # from ??.

    Its probably a typo.
    It was a typo. They have since corrected it with the correct constant of 450240………….Vince

    Here is a little explanation I typed up:

    • This reply was modified 1 year, 5 months ago by symo Symo.
    • This reply was modified 1 year, 5 months ago by symo Symo.
    January 5, 2007 at 7:18 pm #503692 Back to Top REPORT
    symo
    Symo


    Joined: 6/29/2004
    Here is a calculator for y’all. :thumbup

    [flash width=500 height=100 loop=true]KineticCalc[/flash]

    Here is a stand-alone version for your PC: KineticCalc.exe[/url:38t1i3lq]

    August 24, 2007 at 8:34 pm #503693 Back to Top REPORT



    Joined: 5/24/2004
    :thumbup

    Symo, the calculator is an awesome posting… To bad we can download it and/or save it to our desktops… Thanks again for your helpful threads, links, videos, postings…

    B.

    August 24, 2007 at 8:39 pm #503694 Back to Top REPORT



    Joined: 5/24/2004
    :thumbup

    Symo, the calculator is an awesome posting… To bad we can’t download it and/or save it to our desktops… Thanks again for your helpful threads, links, videos, postings…

    B.

    January 1, 2008 at 8:28 pm #503695 Back to Top REPORT



    Joined: 5/24/2004
    Thanks Symo, your calculator is awesome!
    Someone remind me of *suggested* KE values for Big Game please.
    I think elk is 55??
    February 9, 2008 at 4:43 am #503696 Back to Top REPORT

    Carlos

    Joined: 12/10/2004
    I shoot my 570 gr arrows at 218 fps for 60 foot-pounds of KE , pull is 63 pounds.
    January 10, 2009 at 8:07 am #503697 Back to Top REPORT
    ordoublelung
    ORDoubleLung

    Joined: 1/3/2009
    The calculator is awesome. Now all we have to realize is the KE that we calculate is at the bow and not down range. I need to get a stand up chrono to see what the actual energy is at the target for different arrow weights. Has anyone actually done this yet? #-o #-o
    January 10, 2009 at 1:44 pm #503698 Back to Top REPORT
    dublelungem
    DubleLungEm

    Joined: 2/23/2008
    The calculator is awesome. Now all we have to realize is the KE that we calculate is at the bow and not down range. I need to get a stand up chrono to see what the actual energy is at the target for different arrow weights. Has anyone actually done this yet? #-o #-o

    i think rem tried that :whistle :whistle

    March 20, 2010 at 12:41 pm #503699 Back to Top REPORT
    develobear
    develobear

    Joined: 10/12/2008
    :-B You should add entry fields for elevation and latitude to get the acceleration of gravity correct.

    KineticCalc[/flash]

    Here is a stand-alone version for your PC]KineticCalc.exe[/url:22okxhwk][/quote:22okxhwk]

    August 28, 2010 at 7:10 pm #503700 Back to Top REPORT

    Jeff H.

    Joined: 9/12/2008
    hmm i would have explained it a little differently.

    if 1 lb mass = 7000 grains, then only the first conversion factor in the above equation would have been necessary, as the resulting units would have been those of energy (mass x speed squared).

    i would have rather given the first conversion information as:

    1 lb = 7000 grains

    the second conversion factor is necessary because we must get pounds (a unit of force) into slugs (a unit of mass).

    i would use the following for the second conversion factor:

    32.174 lb = 1 slug

    so everything together would be:

    14,112,000 grain ft^2/s^2 x (1 lb / 7000 grains) x (1 slug / 32.174 lb) = 62.66 slug ft^2/s^2 = 62.66 ft lb

    that’s just my take on it anyway :P

    September 10, 2010 at 7:40 am #503701 Back to Top REPORT
    reezman
    ReezMan

    Joined: 9/4/2010
    Thanks for the calculator, Please keep it available!!!! [=}=]
    October 15, 2010 at 9:00 pm #503702 Back to Top REPORT

    djbowhunter

    Joined: 10/15/2010
    thank you.
Viewing 12 posts - 1 through 12 (of 12 total)