1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Car Crash Physics Involving Skid Marks

  1. Jul 11, 2012 #1
    1. The problem statement, all variables and given/known data

    Two vehicles crash at an intersection
    Mass of vehicle one: 1858kg
    Mass of vehicle two: 2865Kg

    Vehicle one was headed North
    Vehicle two was headed East

    The two vehicles stuck together in a t-bone fashion and the two vehicles left the intersection stuck together, moving at an angle of [N67E].

    The vehicles left 40.0m skid marks behind.

    15.334m of skid marks were on wet asphalt with a friction coefficient of 0.8.

    24.6666m of skid marks were on dirt with a friction coefficient of 0.5.

    Determine the initial velocity (before the crash) of vehicle one.

    I am instructed to use kinematics and dynamics to solve this problem.

    2. Relevant equations

    Vf = Vi + 2ad

    Fg = mg = weight = normal force

    fk = µkFN

    3. The attempt at a solution

    I created a free body diagram but do not know how to approach the problem, any help is appreciated.
    I have also searched this website for similar answers but non applied to my problem
    Last edited: Jul 11, 2012
  2. jcsd
  3. Jul 12, 2012 #2
    *SOLVED* //Close-Thread
  4. Jul 19, 2012 #3

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    Imagine another student has a similar problem and googles it - google shows them, amongst others, your thread. They get here, read your question and get excited: here is someone havinf the same problem!!! Then they read the next post ...
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook