# Calculate Friction based on v, t, m &amp; F

1. Mar 27, 2008

### ital_dj

[SOLVED] Calculate Friction based on v, t, m &amp; F

1. The problem statement, all variables and given/known data
A dragster reaches 350km/h from rest in 6.2s. If the car is 800kg and generates a driving force of 1600N, find the force of friction acting on the car.

2. Relevant equations
Fnet = ma

3. The attempt at a solution
I tried converting, and then got lost from there. 350km/h is now 97.2m/s. What do I do now? How do I get friction... I know it's got something to do with gravity.

I just found out the acceleration which is 15.68m/s$$^2$$

Edit: I got 10944N for Ff, and the book is 10900N. I can't believe I'm even close, lol, but what did I do wrong? Or is it just the book rounding it, because I've found other numbers rounded.

Last edited: Mar 27, 2008
2. Mar 27, 2008

### Snazzy

The book rounded. You did it right if you got that answer.

3. Mar 27, 2008

### ital_dj

Alrightt!!! Thanks... at least I'm catching on to some things, and won't fail that bad :)