GRAVITY DOES NOT PULL YOU FORWARD!!!!!!!!!!

explain the 3:30 mile then...

You are an idiot

Gravity is a vector force

Meaning it has x, y, z coordinate

Not important (which are the three components of the position vector r:

r = xi + yj + zk, i, j, k being the Cartesian units vector for a three dimensional case)

Let’s consider a case with just two dimensions y is the vertical and x the horizontal

Force F is equal to mass m multiplied by acceleration a: F = ma, gravity is an acceleration symbolized by g resulting in F=mg, the value of gravity near the surface of the earth is about 9.8m/s. Actually it’s not gravity that is propelling you forward but the normal force of the ground pushing back up but the math is the same.

So the magnitude of vector force of gravity F in the x, y direction:

Fx = m•g•cosè,

Fy = mgsinè

So if you were to lean forward 10 degrees from the vertical (equal to ð/18)

Fx =mgcos10°

Fy= mgsin10°

So in this case there is a forward force due to gravity equal to Fx =mgcos10°

Also when you lean forward and begin to fall there is a torque due to gravity that pulls you forward slightly down gradually changing direction in a circular motion if not stop by the ground. (Center of mass and center of gravity are interchange under this case)

On that note when you are running and you stick your leg out front and lean forward you place your center of mass further forward then when you stand vertical meaning gravity will cause your body to rotate forward until you fall flat on your face but because you are running and don’t fall by applying your own forces there is a constant torque in the forward direction

All you did was rotate your coordinate system 10 degrees so there is a small component of force due to gravity "forward".

Unforunately, due to the indepedence of spatial directions, gravity cannot contribute work towards your forward motion in any way if you are running on flat ground, so all that nonsense about torque is irrelevant.

Doctor Stupid was right.

So gravity can never push you forward?

Rollercoasters are powered by gravitry (after the lift).

Does a rollercoaster ever move you forward?

tank wrote:

So gravity can never push you forward?

Rollercoasters are powered by gravitry (after the lift).

Does a rollercoaster ever move you forward?

That's translation. You're conserving your momentum. The initial downhill created that momentum (mass of car times velocity) which is what carries you through the rest of the roller coaster ride. Friction (air and wheel) is the force that eventually slows you down. Momentum is conserved in all three dimensions.

Certainly, momentum is applied to the mechanics of running. Each stride does produce some component in the vertical direction and your body is acted upon by gravity bringing you back into contact with the earth. In that sense, you do "fall forward" (the combination of momentum and gravity) but that is coupled with the initial propulsion which raised your center of mass to begin with (i.e., there is no net gain). Once you figure in the losses (inefficiencies), I think the less vertical you have the better (thus an argument for shorter, faster strides).

Dear Dumbass,

It is a figure of speech.

Please take that pole out of your ass.

The end.

A really good way to prove your "law" would be for you to run as fast as you can, then trip. Right under you would be a nice soft pillow, five feet away would be chuck norris. If your law is correct, you would fall imediately to the ground on to the pillow. If it is somewhat flawed, then you would land right in the clutches of mr chuck norris. As far as I can see, that is the only way of ever ending this conundrum.

Doctor, you are right. There is only one vector to gravitational force, and that is straight down. Any position one is in that allows one to seemingly "fall forward" had to be attained by overcoming gravity in the first place, storing energy, so the net gain is zero. The "stored energy" will be recovered regardless of what one does or doesn't do. The net gain of zero is not strictly correct of course, because some energy is lost due to friction, heat, and other inefficiencies. There is actually a net loss.

Doctor Stupid,

It seems that you are frustrated. Are you self prescribing medication again. Don't take out your anger on the POSE METHOD, it is merely a most ideal model with which to help you learn to run with maximam efficiency, so you will be less likely to get an injury and thus learn to run faster. If you can't understand how and why you should imploy this technique into your running style it is okay don't panic. Just continue to run the best you can. Best of luck!

Anybody who posted any kind of physics explanation in favor of/opposing the fact that gravity pulls you forward (or whatever the hell you're trying to proove) is the dumbest person alive. This post is retarded becasue the original poster is too stupid to realize what somebody was too stupid to say. Basically, you're all idiots.

Doctor Stupid, come on man. I am a physics major at the local yokel community college and I can prove you wrong. In Quantum Mechanics the Schrodinger Equation says the time derivative of the wave function * ih/2*pi = the hamiltonian acting on the wave function. Due to the heisenburg uncertainty principle we can show that while running on a horizontal surface the running wave function can actually borrow some gravity to pull it forward for a short period of time.

i love it ... keep hating in your house with you wife and kids and your car

you see me running fast with good form but you still are jealous of ME!!!

i love it

you have to find a reason to hate me, cause you know your wife has those nasty thoughts about me when your not around, i can tell buddy

- but don\'t worry it\'s against my morals to do her buddy

and be a man and say all the shit you talk about me to MY FACE, like a man that you claim to be.

I\'m not scared buddy, we can swap it out

Doctor Stupid wrote:

GRAVITY DOES NOT PULL YOU FORWARD!!!!!!!!!!

orbit? ever heard of the constant free-fall?

i don't know whether this can apply to a runner in the way (rather: magnitude) that Dr Pose-and-So suggests, but if an orbiting body can move "forward" due to gravity then that same force applies to any body in the same "forward" motion.

I certainly have limited knowledge of physics except what I can recall from high school but let me examine your post and think this logically through.

There are two issues. 1) being an abstact question of physics - Can gravity pull you forward; and 2) a running physics question - How does gravity effect stride effeiciency in regards to length and elevation?

1) Yes the force of gravity can propell in many different directions even up. A rubber ball will bounce up due to the force and momentum placed upon it by gravity.(Momentum caused by gravity becomes greater than just gravity) Your argument might be that it takes enegy to lift the ball to a height so its not the energy of gravity but its stored energy that is released. But that is always the case when discussing gravity in all situations.

2) I believe gravity can effect stride efficiency. A high elevation or jump is made more inefficent due to fighting the force of gravity. When you are airborn gravity only pulls you down and makes you more inefficient. However the vector of gravity can be changed to a forward motion as you lean and pivot forward on your front foot. Similiar to an upsidedown pyramid falling forward off its point.

This might suggest the efficacy of short strides. (Not sure on this though)

statman wrote:

orbit? ever heard of the constant free-fall?

i don't know whether this can apply to a runner in the way (rather: magnitude) that Dr Pose-and-So suggests, but if an orbiting body can move "forward" due to gravity then that same force applies to any body in the same "forward" motion.

objects in orbit are not being pulled forward by gravity. there are two forces at play. one is the momentum of the object and the other is gravity. if you could imagine an object orbiting the earth and then a sudden cessation of earth's gravitational field the object would fly off on a tangent, still moving forward. if it was gravity that was pulling the object forward the object would simply come to a complete stop in the absence of gravity. and if you could imagine the momentum of the object suddenly disappearing the object would fall straight down. it is the combination of gravity and momentum that causes an object in orbit to move the way it does.

this thread is very revealing about the idiocies of this board. some of you need to go back (ahead?) to high school and get your shit straight.

doctor stupid, keep fightin the good fight.

man, this is 7th grade physics. given a plane, Fgravity is perpendicular to the plane (in this case, the flat ground you're running on). end of story. the rest of the equation is resolved considering momentum, Fapplied by your muscles, drag/friction, etc.

of course, Fgravity provides extra hindrance / assistance when running up / down hill, x by trig factors. since Fgravity is still pointed towards the earth's core, the only time gravity would be resolved to do anything close to 'pulling you forward' would be when running downhill. which is pre 7th grade physics.

as far as the pose method, the masses are more willing to swallow a big lie then a small one.

I can't believe it took that long for somebody to post a correct explanation. You're all idiots, except for YoungJeezy, who was also correct.

gerry lambeau wrote:

man, this is 7th grade physics. given a plane, Fgravity is perpendicular to the plane (in this case, the flat ground you're running on). end of story. the rest of the equation is resolved considering momentum, Fapplied by your muscles, drag/friction, etc.

of course, Fgravity provides extra hindrance / assistance when running up / down hill, x by trig factors. since Fgravity is still pointed towards the earth's core, the only time gravity would be resolved to do anything close to 'pulling you forward' would be when running downhill. which is pre 7th grade physics.

as far as the pose method, the masses are more willing to swallow a big lie then a small one.

Its quite obvious that gravity is a downward force perpendical to a plane. The question is if that downward force, that energy, can be used to increase forward momentum. I have read no clear refutation of that being impossible.

Actually what you experience as the force gravity is actaully the warping of space and time by mass which manifests itself as falling.