Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Calculate Friction based on v, t, m & F

  1. Mar 27, 2008 #1
    [SOLVED] Calculate Friction based on v, t, m & 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[tex]^2[/tex]

    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. jcsd
  3. Mar 27, 2008 #2
    The book rounded. You did it right if you got that answer.
     
  4. Mar 27, 2008 #3
    Alrightt!!! Thanks... at least I'm catching on to some things, and won't fail that bad :)
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook