friction and terminal velocity of a parachutist vs a car

[raaaid]

not really if you apply a force of two newtons to a 1 kg car and theres a rolling friction of 1 N applying f=ma you have a constant aceleration of 1 m/s

everybody knows the faster you go the more it takes to acelerate

according what im studying this is just due to wind friction

but I THINK this is also due to rolling friction increasing with velocity which what im studying denies or neglects

edit:

if what i say its true it brings new grounds on driving

you could have more grip if the wheels turn fast enough skidding than gripping since if v affects friction could be posible to make v as high as that dinamic friction gets bigger than static friction

in fact i recall in f1 times when the cars did go all skidding

[Sternjaeger II]

raaaid do you have a job?

[GraveyardJimmy]

Originally Posted by raaaid

not really if you apply a force of two newtons to a 1 kg car and theres a rolling friction of 1 N applying f=ma you have a constant aceleration of 1 m/s

everybody knows the faster you go the more it takes to acelerate

according what im studying this is just due to wind friction

but I THINK this is also due to rolling friction increasing with velocity which what im studying denies or neglects

Yes, my point is once you reach a high enough velocity wind resistance (or drag) it requires far too much force to move due to resistance increasing with the square of velocity. Therefore acceleration cannot remain constant due to this resistance.

Power required to overcome is:

P= 1/2 p v^3 A C .

Therefore (ignoring constants) power to overcome increases in relation to the cube of velocity, which is not negligible and is the major problem.

[raaaid]

and what would happen if you had a road in the moon

could a 50 horse power car amke the moon rover reach 30000 km/hour taking into account the terminal velocity thing only happens for fluid friction and nor for road friction?

nope i dont have a job now ususally i teach english to kids

[bongodriver]

Poor kids.

[raaaid]

oh havent you noticed my patience? you need that to deal with kids

i never get annoyed however much attacked

i have a degree in english filology but really what capacitates me for that is my inherited patience

[raaaid]

according what im studying if you drop a block in a ramp and the block moves it does it in an ACELERATED fashion

come on it calls to the common sense it will very soon reach terminal velocity and that at that low speeds wont be due to the wind resistance

so dynamic force of friction in surface= MU* normal force is FALSE

what i wonder is if it is a typical neglection or just a wrong conceptualization

[ACE-OF-ACES]

Originally Posted by raaaid

according what im studying

You said art classes right? If so I recomend you stick to it!

[bongodriver]

Originally Posted by raaaid

oh havent you noticed my patience? you need that to deal with kids

i never get annoyed however much attacked

i have a degree in english filology but really what capacitates me for that is my inherited patience

Philology.....

[bongodriver]

can you sculpt a 'troll face' ?