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: Velocity of sliding object

  1. Feb 20, 2013 #1
    1. The problem statement, all variables and given/known data
    Block slides down a 1 meter ramp at a 30 degree angle. The coefficient of kinetic friction is 0.4
    what is the block's speed at the bottom of the ramp?

    2. Relevant equations

    kineticFriction force = coefficient of friction X normal Force

    normal Force = force of gravity + mass*acceleration

    3. The attempt at a solution

    I've tried the problem but i get stuck of finding the normal force required to find the kinetic friction force. Can someone guide me a little bit please... thank you in advanced
  2. jcsd
  3. Feb 20, 2013 #2
    The normal force and the component of the weight of the block need to cancel each other out.
  4. Feb 20, 2013 #3
    solved!! the professor gave us a formula but I copied it wrong... just for reference the formula which gave acceleration was a = g[sinO - UkcosO]
  5. Feb 20, 2013 #4
    Physics not about memorizing formulas, it is about deriving them from first principles, so can you?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook