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Not sure if this has been posted before - I haven't seen it. Check it out.

http://media.putfile.com/RisebyBap

To many race videos use disturbed for music, but other then that it was pretty cool. I liked the cobra scene.

i hope if go down that fast that i just slide along then stand up and walk off. that would make me happy.

wow great vid

!!there's a cobra on the track at 2:30!!!

I cant see it. They dont have DSL in the village I live in. This stinks

wow. that was cool.
there were some pretty nasty spills there. I saw the guy at the end get on his feet, but do you think most of those guys just walked away from those accidents?
Just wondering , i dont know much about moto racing at all. Never seen a race.

that was sweet.

-Holiday wrote:wow. that was cool.
there were some pretty nasty spills there. I saw the guy at the end get on his feet, but do you think most of those guys just walked away from those accidents?
Just wondering , i dont know much about moto racing at all. Never seen a race.

Reaching WAY back to my physics days they don't ACUTALLY hit that hard, impact with the ground is the same if you're walking at 1kmh to falling off a bike at 200kmh assuming you fall from the same height. Your vertical acceleration and deceleration will remain the same.

Now, the horizontal speed or acceleration that comes into play is what causes most of the damage, like when you slow down suddenly (wall) or start to tumble (snapping limbs) then it's an issue. But assuming they just slide and slide and slide there should be relatively few injuries (excepting road rash).

Does that make sense? Your impact when you fall is relative only to the height from which you fall, the speed at which you fall is irrelevant, until something stops you, or causes you to roll.

Sevulturus wrote: Reaching WAY back to my physics days they don't ACUTALLY hit that hard, impact with the ground is the same if you're walking at 1kmh to falling off a bike at 200kmh assuming you fall from the same height.

Does that make sense? Your impact when you fall is relative only to the height from which you fall, the speed at which you fall is irrelevant, until something stops you, or causes you to roll.

Somewhat oversimplified Sev, but you're on the right track. Your potential energy is based on height (energy of position) while your kinetic energy is based on your velocity. You're right - "falling" off the bike won't do anymore damage at 1kmh than at 200kmh, however, your kinetic energy is so high due to your velocity, that the damage done is much much higher. Assuming that you are 100kg (212lbs) travelling at 10kmh - your kinetic energy is only 1/25th as much as if you were travelling 50kmh and 1/100th as much if you were travelling 100kmh.

This is very simplified, as it doesn't take into account the force of friction and assumes you're sliding, not tumbling or bouncing off of objects.

Of course, like I said, the initial impact with the ground will have exactly the same force if you fall off the side at 1kmh or 200kmh. However once you start rolling around, tumbling or stopping you're going to get hurt a lot worse. The danger in a highspeed fall isn't the fall, but how you stop, or what you do while you're stopping.

So a low speed crash is SAFER because you're less likely to tumble or slam into something REALLY hard, but if you have a clear run out in which you just slide rather then roll or tumble and don't slam into something like a wall the only real damage you're going to be getting is road rash from the speed.

The way you get rid of the kinetic energy is the deciding factor.

That's all I was trying to get out there.


Similarly, when the rider highsides and gets catapulted off the bike he is falling from further and is therefore more likely to be hurt from the impact.