friction and terminal velocity of a parachutist vs a car

[raaaid]

what i think now is that nowadays racing tyres have so much difference between dynamict and static coeficients of friction that drive gripping is an advantage over sliding

but i recall mentioned times when sliding was an advantage

i can see why by dynamic friction increasing with speed

probably in this old components dinamic and static coeficients were close

[WTE_Galway]

Perhaps that is the problem with the parachutist, insufficient static coeficients of friction.

It is possible that could be improved with buttered toast.

[ACE-OF-ACES]

Originally Posted by raaaid

what i think now is that nowadays racing tyres have so much difference between dynamict and static coeficients of friction that drive gripping is an advantage over sliding

but i recall mentioned times when sliding was an advantage

i can see why by dynamic friction increasing with speed

probably in this old components dinamic and static coeficients were close

Interesting?

So your saying you belive the coefficient of friction of tires has changed over your lifetime?

And that somehow your existence on this planet has affected the coefficient of friction of tires?

Hmmmmm

You may be onto something there?

Because looking at your picture, I think if you were to plot the number of hairs on your head for each year of your life

THAN TAKE THE INVERSE OF THAT GRAPH

And than plot the coefficient of friction of tires for each year of your life

I predict that they will be trending in the same direction!

At which point I think you could make the argument that your existence on this planet has in some way affected the coefficient of friction of tires over your life time!

[Rumcajs]

Hi Raaaid,
what exactly is this "terminal velocity of a parachutist vs a car"? Is that the speed which when exceeded by a parachutists who is going to hit a car terminates his life?

Are you searching for the correct formulas for two cases?
1) The parachutist is falling down through the air and hits the car
2) The car is moving horizontally and hits the parachutist after he has landed

Well i have no mathematical proof but regardless friction they'll be the same.