None of which explains the Word 'hangs'. What you described is what is referred to as having a good spring/getting up well.
Javier Hernandez | 2010/11 Performances
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None of which explains the Word 'hangs'. What you described is what is referred to as having a good spring/getting up well.
I'm no physicist, but I always thought someone who hangs in the air for longer does so beccause of the ratio between the force applied upwards (the jump) and the force pushing back down (gravity and mass).
Someone such as Hernandez who, despite being of quite a slight build, can exert quite some force upwards (fast twitch fibres and all that) is likely to take longer to come back down due to the fact that he will inevitably weigh less.
This could be bollocks mind, but it seems to make sense.
Someone such as Hernandez who, despite being of quite a slight build, can exert quite some force upwards (fast twitch fibres and all that) is likely to take longer to come back down due to the fact that he will inevitably weigh less.
This could be bollocks mind, but it seems to make sense.
Players can't hang in the air, they can just manipulate their gravitational centre, through their actions when they jump, which makes it look like they can hanging.
Surely it's one's trajectory that gives the illusion of hanging in the air?
Head position stays the same, whereas position of cg is changed. That gives the illusion of hang time.
Can you rewrite that in a fashion that I can understand, please?
Simplifying it, the way Hernandez jumps gives an illusion of hang time, because his head remains at the same height for what seems like a period of time.
In reality, he took as much time getting back down to ground than he did getting to the maximum height of his jump.
And you contend that he achieves this by altering his centre of gravity?
I'm guessing that what SAF is refering to is the ability in a player to readjust one's body position post-leap in order to better anticipate and prepare for contact with the ball and thus gain more accuracy on the header; most players I imagine just jump and hope, or use their superior strength to bully thier way into the ball's flight path, but the better ones are able to contort even after jumping to increase the chances of making contact with the ball, such technique will have little to do with physical strength and more to do with vision, reflex and flexibility. I suppose such contortions may produce the illusion of 'hanging in the air' because the head position is no longer the 'straight up and down' that we see more commonly in less talented players, it's now adjusted mid-flight to keep the head exactly where it needs to be.
You're rewriting the laws of physics here, mate.
No, he is correct. I have heard of extreme cases where really small guys have managed to " hang" in mid air up to 15 minutes. This is only possible if the force going upwards is within 90 % of the force going downwards after the first 25 seconds of hang time. Or if the start of the jump takes place below sea level and the landing is above sea level.
Your leg movements affects the position of your gravitational centre. Compare the cg between you jumping with your legs straightened and you jumping with your knees tucked closely to your stomache.
15 minutes?! that can't be right
I don't know whos taking the piss or not, but from someone with a relatively basic background in science it's simple.
As a jumper, you either are rising in the air as a result of your initial jump, or you are falling back to earth as a result of gravity. There is no period of "air" or "hangtime" where jumpers are freely suspended, not rising or falling. Any resemblance of this is just an illusion.
As a jumper, you either are rising in the air as a result of your initial jump, or you are falling back to earth as a result of gravity. There is no period of "air" or "hangtime" where jumpers are freely suspended, not rising or falling. Any resemblance of this is just an illusion.
Oh my gosh. Top is baaaack!!Pretty much this. I can't get my fingers to type everything out, I blame the lack of sleep.
Something doesn't fall faster just because it weighs more.
Stop rewriting the laws of physics. Acceleration downwards is the same regardless of whether you weigh as much as Drogba or whether you weigh as much as hernandez.
Hernandez probably seems to hang in the air longer simply because he jumps higher i suppose.
Hernandez probably seems to hang in the air longer simply because he jumps higher i suppose.
As I said, it was just a guess.
Hernandez's skin is very rough and the turbulent boundary layer drag is immense; his coefficient of drag, from a rough observational estimate, is approximately 300, so at the moment that he is falling at 0.5m/s, his net acceleration downwards due to gravity and aerodynamic drag is 8.5m/s^2, giving the illusion that he has extended "hang time".
fergie not a big fan of chicha at the minute determined to ride rooney and berba to death
Flippin' heck... that's something for him to put in his pamphlet when he's at the end of his career and ravaged by damages and trying to find a new club, eh?
You left out his kit acts as a form of parachute which increases his drag force as compared to other players like Anderson
Real Madrid Coach Jose Mourinho Wants To Raid Manchester United For Javier Hernandez
well I did say Real will be sniffing....
Real Madrid Coach Jose Mourinho Wants To Raid Manchester United For Javier Hernandez - Report - Goal.com
Real Madrid remain in the search for a striker in January with Manchester United's Javier Hernandez at the top of Jose Mourinho's wishlist.
Real Madrid mastermind Jose Mourinho has urged club officials to increase efforts to land Manchester United forward Javier Hernandez in January, according to Mexican website Record.com.mx.
Despite Karim Benzema beginning to find his feet for los Blancos since the injury of Gonzalo Higuain, Mourinho is looking to further bolster his options in that department.
Real Madrid will however have to do a lot of persuading to force Sir Alex Ferguson to part with his highly rated 22-year-old Mexican international, Manchester United having only signed the tricky forward just before the World Cup in the summer.
Other targets that have been touted around the media for a New Year swoop include Wolfsburg's Edin Dzeko and Athletic Bilbao's Fernando Llorente.
well I did say Real will be sniffing....
Real Madrid Coach Jose Mourinho Wants To Raid Manchester United For Javier Hernandez - Report - Goal.com
Real Madrid remain in the search for a striker in January with Manchester United's Javier Hernandez at the top of Jose Mourinho's wishlist.
Real Madrid mastermind Jose Mourinho has urged club officials to increase efforts to land Manchester United forward Javier Hernandez in January, according to Mexican website Record.com.mx.
Despite Karim Benzema beginning to find his feet for los Blancos since the injury of Gonzalo Higuain, Mourinho is looking to further bolster his options in that department.
Real Madrid will however have to do a lot of persuading to force Sir Alex Ferguson to part with his highly rated 22-year-old Mexican international, Manchester United having only signed the tricky forward just before the World Cup in the summer.
Other targets that have been touted around the media for a New Year swoop include Wolfsburg's Edin Dzeko and Athletic Bilbao's Fernando Llorente.
well I did say Real will be sniffing....
Real Madrid Coach Jose Mourinho Wants To Raid Manchester United For Javier Hernandez - Report - Goal.com
Real Madrid remain in the search for a striker in January with Manchester United's Javier Hernandez at the top of Jose Mourinho's wishlist.
Real Madrid mastermind Jose Mourinho has urged club officials to increase efforts to land Manchester United forward Javier Hernandez in January, according to Mexican website Record.com.mx.
Despite Karim Benzema beginning to find his feet for los Blancos since the injury of Gonzalo Higuain, Mourinho is looking to further bolster his options in that department.
Real Madrid will however have to do a lot of persuading to force Sir Alex Ferguson to part with his highly rated 22-year-old Mexican international, Manchester United having only signed the tricky forward just before the World Cup in the summer.
Other targets that have been touted around the media for a New Year swoop include Wolfsburg's Edin Dzeko and Athletic Bilbao's Fernando Llorente.
This is old news. This rumor came out almost a month ago when Hernandez kept scoring every game for us.
Swap him with Ronnie and you might have a deal Jose
I'm sure there's probably some kind of scientific evidence that you can point towards but if I drop a tissue and a remote control from the same height the remote control hits the deck sooner.
thats because there is air resistance, as the tissue paper is only so little more dense than air. Plus the tissue paper is probably spread out, so theres a larger surface area for air to push up.
Now roll the tissue paper up into the smallest ball possible, u find it falls at about the same speed as the remote control.
Now pick up hernandez and drogba and drop them at the same time, they both fall at the speed as well.
We have a winner. Everyone talking about adjusting the body mid flight, and altering your center of gravity are talking rubbish.
Time in air is a function of how high you jump. People saying it looks like you hang in the air, are saying "wow you jump really fecking high because my eye is able to clearly differentiate between a typical 18 inch vertical leap, and a 32+ inch vertical leap where you are airborne an extra thousandth of a second!"
I'd like to know what Hernandez' vertical leap is, I'd guess in the 32-36 inch range.
Perhaps not the exact same speed, but the speed is so close it is probably beyond our ability to accurately measure it ;p
Goal.com, sigh.
Regarding the "hang time" discussion; the visual perception of a player 'hanging' in the air longer in my opinion also depends on the player flexing his knees mid-air, so that it appears like he has jumped higher from the ground than he actually has, meaning that his feet are further away from the ground for a longer period of time than when a player jumps and lands with his legs extended, thus appearing to 'hang' in the air.
So since when did a thread on 1 of the hottest young strikers in Europe turn into a discussion on how other men jump?
So since when did a thread on 1 of the hottest young strikers in Europe turn into a discussion on how other men jump?
Hot young striker you say?
have missed him lately.
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