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 on banked curve with Friction

  1. Jul 22, 2009 #1
    1. The problem statement, all variables and given/known data
    A car of mass 1200 kg enters a turn of radius 20 m traveling at 12 m/s. The curve is banked at an angle of 37°. What is the normal force on the car by the road? (Assume that there is friction, and use g=10 m/s2.)

    2. Relevant equations

    3. The attempt at a solution
    I feel like this problem should be so easy, but for some reason I cannot come to the correct solution. There are 3 forces for this problem: mg, Normal and friction.

    So far, what I got is this:

    mac=N sin [tex]\theta[/tex]+[tex]\mu[/tex]s N cos[tex]\theta[/tex]

    0=N cos[tex]\theta[/tex]-[tex]\mu[/tex]s N sin[tex]\theta[/tex]-mg

    Am I on the right path? and how do I solve this without given the mu s?
  2. jcsd
  3. Jul 22, 2009 #2
    mutiple the X-direction equation by [;\sin;][;\Theta;]
    and the Y-direction equation by [;\cos;][;\Theta;]
    then add them.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook