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can you please explain the forces which make a car move.......since if only friction forces were responsible for accelerating the car then every car will have the same maximum acceleration that is ug ( mu * g) this makes BMW, FERRARI, PORSCHE all equal but indeed each car has different acc. ..........how to account for it.........thanks a lot
- luv (age 17)
You're right that the acceleration would be limited to μg, and that this limit depends on the tires and the road, not the engine. When a car starts from rest, the initial power (Fv) is very low because velocity v is initially zero, so different cars start off with that same limit. However, once the car has gotten moving, it requires a lot of power to accelerate it more. The cars will all accelerate less than μg, and how much less will depend on how powerful the car is.
(published on 04/30/2009)
Follow-Up #1: car acceleration
do you mean the maximum acc. possible on ground is ug......
but u is generally very less so ug will not be much...but some cars claim : 0-100 kmph in just 4-5 second.secondly how much power can be delivered due to streamlinig.Since good sports car like ferrari and all are to streamlined..thanks again
- luv (age 17)
You're right that the maximum acceleration for some cars can be in the neighborhood of g, 9.8 m/s2
. That means that the coefficient of friction, μ, has to be around 1 or so. (There's no rule that it can't be larger than 1.) According to the first sources I found via Google, the typical rubber-asphalt μ is about 0.8. So an acceleration of about 8 m/s2
is possible. That would give 0-100 kmph in about 3.5 s.
(published on 05/04/09)
Follow-up on this answer.