Weber rolling out. And he’s gonna throw deep for Decker. What a grab! Touchdown, Minnesota! Looks like that hit on Golden Gopher wide
receiver Eric Decker didn’t feel too good. Decker shaken up as he got hammered. The blast from Cal safety Sean Cattouse
had enough force to cut Decker’s jaw open. And while Decker clearly was uncomfortable after
the hit, the Gopher athletic staff was able to stitch him up so he could
head back into the game, which is amazing considering
the force his body withstood. Just to hold on to that ball is a testament
to the hand strength of Eric Decker. But hold on a minute, just how
much force did Decker endure? How hard was that hit? How many Gs did Decker experience
during that hit? To find that answer we took University of
Minnesota Physics professor Dan Dahlberg out to the TCF Bank Stadium field to break down the science behind Decker’s
amazing touchdown catch. Knowing the time and the
distance where he landed, I can now calculate what that velocity was. To find those numbers, Dahlberg
first had to study some film. Using the game footage, he was able to break
down the play in several different ways, coming up with estimated speeds
of Decker, Cattouse, the impact and the time it took for
the both players to land. Next comes the math. And so that acceleration that he was
experiencing was 345 feet per second squared. Knowing factors like Decker’s speed in the
40-yard dash and the time it took for him to travel between the 10 and 5 yard lines,
which was determined by watching the video, Dahlberg was able to come up with an equation
that allowed him the estimate the amount of G force exerted on Decker’s
body during the brief impact. And the key to doing that was determining
the distance between where Decker was hit to where he landed on the ground. And so in terms of Gs I’m going to take
this 345 feet per second squared and divide that by the acceleration due to gravity,
which is 32 feet per second squared, and when we do this we find that
his acceleration was 10.7 Gs. To be precise, Dahlberg says Decker
felt 10.78 Gs of force during the hit. Now that 345 feet per second squared divided by
32 feet per second squared, which is the force of one G, gravity, and that’s how you get 10.78. 10.78 Gs of force that Decker
suddenly felt during that hit. Now, that’s a pretty big number. I found one report online where Navy carrier
pilots undergo acceleration of about three Gs where they’re taking off from the
catapult assist on the flight. In car wrecks it looks like you
could have as much as 40 Gs. To give you some idea, this 10.7 Gs, if Decker
weighs say 200 pounds, right at that point, during that collision, he’s
weighing more than a ton. Standing on the field, with no other forces
factored in, Eric Decker weighs 220 pounds. For a brief moment during the impact,
Decker had 10.78 Gs thrusting him. 10.78 times 220 is more than 2,30,
which means for that brief impact, Decker felt like he weighed 2,300 pounds. That’s more than three and a half
times the force Navy pilots feel when they’re being catapulted
off an aircraft carrier’s deck. And yeah… Following the review, the ruling on the
field of touchdown has been confirmed. — Decker held on for the touchdown.

Physics of Football
Tagged on:                                                                         

100 thoughts on “Physics of Football

  • December 14, 2009 at 2:19 pm
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    wow, what a fucking geek is this man…
    i don't understand shit of what he wrote down on that board…

    Reply
  • December 14, 2009 at 4:03 pm
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    that is because you are officially retarded. maybe go back to college, if you ever went in the first place dumbshit.

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  • December 14, 2009 at 4:04 pm
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    haha! hillarious, it is very much so highschool physics, with some advancement classes

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  • December 14, 2009 at 11:31 pm
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    Saying from a student in highschool, I could of figured this out, though for some reason my physics class does m/s^ instead of ft/s^, so yeah.

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  • December 15, 2009 at 12:03 am
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    everyone needs to spread the word about "science czar" John P. Holdren-research what he's all about

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  • December 15, 2009 at 2:42 am
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    give me some feedback here but i think who give a crap about physics in football you run at the guy and you tackle him haha

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  • December 15, 2009 at 8:47 am
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    interesting

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  • December 15, 2009 at 2:18 pm
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    decker also lost 10.78 thousand brain cells during that tackle as well.

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  • December 15, 2009 at 8:53 pm
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    GOOD

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  • December 16, 2009 at 2:43 am
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    ok everyone this might have been a touchdown, and this might not of been a touchdown; however, the ruling on the field was a touchdown. the ref kept it a TD after the review because there wasnt indisputable evidence of whether it was a TD or not. there you go, problem solved.

    Reply
  • December 16, 2009 at 5:14 am
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    doesnt matter, as long as one part of the body crosses the plane by a ball carrier with posession. its a touchdown. remember that mike vick play from a few years ago

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  • December 16, 2009 at 7:39 am
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    damn. interesting stuff

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  • December 16, 2009 at 8:12 am
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    A Cal professor would've done those calculations in his head.

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  • December 16, 2009 at 9:50 am
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    this is not all true . his comin up with all these big numbers and saying that he took 10ft/s2 and shit wen with all the paddin the footballers are wearin it atleast took 50 % of the impact ! pussy stuff 😛

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  • December 16, 2009 at 12:20 pm
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    just a little bit more ,but wait! dad physic need to use for proof the truth?!?!

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  • December 16, 2009 at 5:52 pm
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    Fake and Gay

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  • December 16, 2009 at 9:54 pm
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    This is high school physics. Fail

    Reply
  • December 16, 2009 at 11:03 pm
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    were the audio?

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  • December 17, 2009 at 1:05 am
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    haha 1:30 — gotta have the typical fake skeleton in a science setting.

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  • December 17, 2009 at 1:11 am
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    His speed down the field shouldn't really factor in because it looks like he slowed down at the end there in order to get ready to catch the ball. There's no way he was going as fast as he was down the field when he turned to get the ball, turn back around to go for the goal, etc.

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  • December 17, 2009 at 1:45 am
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    10.78 Gs is well within the realm that the human body can handle. Fighter pilots in say an F-16 routinely and for periods of 10-20 seconds hit 9Gs in ghigh speed tight turns. I played football through college and can tell you, it isn't always the impact that hurts…alot of times it is the hardness of the helmet hitting your hip bone or something like that, or getting stepped on by cleats! cool vid

    Reply
  • December 17, 2009 at 1:45 am
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    yes math is both fake and gay. you are right homophob

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  • December 17, 2009 at 4:52 am
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    Shut up. Two different sports are called different things in different areas of the world. Big fucking deal.

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  • December 17, 2009 at 5:36 am
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    no, football can refer to many different sports depending on where you live

    in Australia, football can mean AFL so in Australia we call NFL "Gridion" or just NFL.

    in England football can mean Soccer

    Reply
  • December 17, 2009 at 7:41 am
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    Go Bears 😀

    Reply
  • December 17, 2009 at 1:10 pm
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    Which other countries still use "feet"???
    Is it just America that is still imperial??

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  • December 17, 2009 at 6:27 pm
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    asads

    Reply
  • December 17, 2009 at 8:42 pm
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    Actually there have been some rugby players in the nfl. The Jets had a kicker that played rugby a few years ago. That man tackled unlike most kickers. He was a good tackler too.

    Reply
  • December 18, 2009 at 12:28 am
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    Why is American and Australian football called football? Ask rugby players because it came from rugby football. They're both modified versions of the sports, they're both high different thougj

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  • December 18, 2009 at 12:58 am
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    How can they call that a touchdown? What the hell?

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  • December 18, 2009 at 3:45 am
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    now calculate how many neurons he lost in that hit.

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  • December 18, 2009 at 5:09 am
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    how is that a touchdown???

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  • December 18, 2009 at 7:46 am
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    pause at 3:28 – ball broke the plane

    Reply
  • December 18, 2009 at 3:52 pm
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    We talk about sport too!!
    Are you tired of people always trying to sell you shit? So am I. Download Lil Wayne the Rebirth FREE, FULL Album. @ THRILLA . NET – board, duh! I received 1 of the 500 copys that was accidently shipped early…. opps!!!

    Reply
  • December 18, 2009 at 9:48 pm
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    nice

    Reply
  • December 18, 2009 at 9:51 pm
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    wow u just took something fun like football and turned it into a boring math problem

    Reply
  • December 18, 2009 at 11:20 pm
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    THAT KID GOT FUCKED UP!!!!

    Reply
  • December 19, 2009 at 5:09 am
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    1:28 – 1:30 "three hundred and fourty five"
    I would expect a physics teacher to properly word a number, it's "three hundred fourty five", there is no and. An 'and' represents a decimal point, so in actuality he is saying 300.45.
    I know this seems like knit-picking, but that's like a food expert confusing a teaspoon and tablespoon measurement.

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  • December 19, 2009 at 2:02 pm
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    There is an ''And''. ''Point'' is used to represent a decimal point, not ''And''.

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  • December 19, 2009 at 3:21 pm
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    @ itsMInuteMaid
    You are wrong. Actually "three hundred and forty five" is grammatically correct in proper English(Britain). Please don't correct a physics professor who has probably studied much longer than you.

    Reply
  • December 19, 2009 at 5:25 pm
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    crazy..

    Reply
  • December 19, 2009 at 8:03 pm
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    He's a professor of physics, IN THE UNITED STATES. Even if what you say is true, that, that is the proper Britian wording, that is NOT the case here. Just as a word or phrase my be grammatically correct in Mexican Spanish, it may not be in Spain Spanish. Language evolves, just like everything else, and the wording for numbers has evolved to how I explained it. I wouldn't be suprised if YOU are wrong, and even in Britian, using 'and' in the middle of a whole number is incorrect.

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  • December 19, 2009 at 8:07 pm
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    Furthermore, in proving my point, you wouldn't say "fourty and nine", that would be incorrect, you would say (as we all do), "fourty nine". You do NOT say 'and', when stating a whole number, again, 'and', denotes a decimal point. I'm quite sure you're wrong, even about British English.

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  • December 19, 2009 at 8:15 pm
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    WHAT?! No, you don't say 'point'. For example, when you say, 'two hundred thirty-three dollars AND forty-five cents' $233.45 (see hoe the and goes where the decimal goes). You wouldn't say 'two hundred and thirty-three dollars and forty-five cents', that would be $200.33.45. When do you say 'point'?

    Reply
  • December 19, 2009 at 8:16 pm
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    [EDIT] 'How' (Typo)

    Reply
  • December 20, 2009 at 1:55 am
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    @itsMinuteMaid you're confusing money with math – two different languages. For money you say "Three dollars AND forty five cents" because you are talking dollars and cents – two different values (dollars AND cents). For numbers in math, since the labels are the same – in this case feet per second squared, you have three hundred and an additional forty five. Same labels, therefore and is allowable – but in math context. True, you cant write it like that on a check, but its allowable.

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  • December 20, 2009 at 2:53 am
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    @itsMinuteMaid What is the past tense of the verb "hang"?
    It is hanged, not hung. There are many ways in which English grammar is counterintuitive. And as titanwr mentioned, math should not be confused with the proper way of writing checks.
    Also your argument of British grammar being unacceptable in the USA is foolish. British English is the way the rest of the world is taught English, and is the world language.

    If you are still not convinced, you can try to research it.

    Reply
  • December 20, 2009 at 5:08 am
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    Wow. And in NFL I bet they take twice that…

    Reply
  • December 20, 2009 at 9:50 am
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    What is G force? ratio of some accelerations?
    -physics noob

    Reply
  • December 20, 2009 at 11:12 pm
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    theres a misscalculation, i suggest to make a review. those calculations were made assuming velocities in oposite directions, there's an angle that wasn't considered…the force is less than 5 G's

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  • December 21, 2009 at 2:29 am
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    i think im actually dumber from watching this..

    Reply
  • December 21, 2009 at 6:38 am
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    haha wtf o_O? so i take it that it was a big hit. no im jus jokin nice breakdown.

    Reply
  • December 21, 2009 at 7:48 pm
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    Apparently its too late for you.

    Reply
  • December 21, 2009 at 11:35 pm
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    10.78 gs is precise but it may lack accuracy since the prof could only estimate the distance with an uncertainty of half a foot from the videos. The announcer didn't take very many science classes, because he grabs onto 10.78, although it isn't meaningful if the actual force differs by say half a g

    Reply
  • December 22, 2009 at 4:17 am
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    has youtube gotten slower for any1 else???

    Reply
  • December 22, 2009 at 6:38 am
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    Yay, Physics!

    Reply
  • December 22, 2009 at 3:47 pm
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    dude this was an awesum breakdown! Mr. Replinger will so love this…I guess he's a football man too…

    Reply
  • December 22, 2009 at 10:46 pm
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    owned

    Reply
  • December 23, 2009 at 3:11 am
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    shut up

    Reply
  • December 23, 2009 at 4:17 am
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    pineapple sundae

    Reply
  • December 23, 2009 at 4:55 am
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    banana

    Reply
  • December 23, 2009 at 10:39 pm
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    It was definately a touchdown. His foot toe tapped at the 1/2 yard line, well in bounds. You only need 1 foot in college ball. The ball does not have to cross the goal line between the pylons, and he doesn't land out of bounds until he was 2 yards past the goal line. He maintained possession through his landing. It's a TD

    By NFL rules, it wouldn't be a touchdown, but that is irrelevant.

    Reply
  • December 24, 2009 at 1:55 am
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    it wuld be a td in da nfl cuz he hit dat orange td stick

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  • December 24, 2009 at 5:13 am
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    i watched this

    Reply
  • December 24, 2009 at 7:18 pm
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    @solgearx

    Typical American sport, only speed and strength, no intelligence or technique whatsoever, except quarterbacks. Every player needs to be doing only one thing during a whole career, but still that's the only way for those dumbasses(most of them are) to finish college.

    Reply
  • December 25, 2009 at 8:09 am
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    Go Bears!

    Reply
  • December 25, 2009 at 3:56 pm
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    well duh, who couldn't have figured that out

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  • December 26, 2009 at 7:09 pm
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    OMFG I Hat Math… 1:20

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  • December 26, 2009 at 7:23 pm
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    who the fuck cares

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  • December 26, 2009 at 7:27 pm
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    Math blah blah blah math…… blah more math…. blah…. touchdown YAY!

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  • December 26, 2009 at 7:38 pm
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    his leg hits the pylon thats clearly a touchdown

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  • December 27, 2009 at 9:56 am
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    mmmmm i love both topics football and physics

    Reply
  • December 27, 2009 at 1:56 pm
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    go back to reading your twilight books bitch

    Reply
  • December 28, 2009 at 12:32 am
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    it wasnt even a touchdown..

    Reply
  • December 28, 2009 at 12:57 am
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    quicklockerz[.]weebly[.]com

    clear the brackets when entering address:)

    Check it out!

    Reply
  • December 28, 2009 at 3:02 am
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    mmmmmmmmmmmmmboring!

    Reply
  • December 28, 2009 at 4:20 am
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    only the ignorant cuss

    Reply
  • December 28, 2009 at 4:21 am
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    even though he held on and got the touchdown,
    Best beat them

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  • December 28, 2009 at 3:57 pm
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    @HwarangOfFaith but u didn't

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  • December 28, 2009 at 4:38 pm
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    wow ur tough

    Reply
  • December 28, 2009 at 5:45 pm
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    Tell me about it.

    I just hate how they make this seem like this is soooo intricately complicated and deep in scientific analysis lol.

    Reply
  • January 8, 2010 at 9:18 pm
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    I'm a cal fan and boy, that is the toughest receiver in college, I hope he does great in the NFL.

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  • January 10, 2010 at 8:15 pm
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    He managed to get one foot down in bounds at 0:23 so he was "in" then, as long as the football crosses the plane of the end zone ( touch down area) before his knee hits the ground, he scores.

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  • February 21, 2010 at 9:07 pm
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    How about you join the civilized world and use the Metric system! No one uses the Imperial system any more

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  • February 23, 2010 at 2:58 am
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    Cal still won though

    Reply
  • April 28, 2010 at 5:49 am
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    Physics + Football… this is awesome.

    Reply
  • June 10, 2010 at 11:36 pm
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    Nice vid. Glad to have him with the broncos. He reminds me of Ed McCaffery.

    Reply
  • December 5, 2010 at 6:01 pm
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    @manurulzz5 It would be kinda hard without the raw data

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  • December 17, 2010 at 1:17 pm
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    @manurulzz5 Why don't you do it? I won't bother. i trust him. I could go thorugh his calculations and simply put the divisions into my calculator and see if he's right. but his formula's checks out. So I won't bother no reason questinoning a professor in most cases. Id estimate it to something around what he got.

    Reply
  • February 28, 2011 at 12:40 am
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    He forgot to use sig figs.

    Reply
  • January 3, 2012 at 2:35 am
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    Never thought football had Physics.

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  • March 16, 2012 at 2:49 am
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    @castusalbuscor I'm American and I agree. Sucks relearning all of my metrics when traveling.

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  • June 18, 2012 at 10:33 pm
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    Thats not a touch down

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  • July 2, 2012 at 4:45 pm
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    The game is set up in the imperial system.

    I know metric and imperial. It's just a cultural aspect that we still value.

    No need to be a pretentious dick or anything.

    Reply
  • July 8, 2012 at 6:32 am
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    Most people do not care about the physics of football, hits and impacts are what they are. I don't need a bunch of numbers and useless information to know how hard a player was hit.

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  • September 1, 2012 at 9:56 pm
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    guess what, hes great now

    Reply
  • March 11, 2016 at 2:40 am
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    Hey my school (Cal) vs my hometown school!

    Reply

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