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: Help with frictional problems

  1. Feb 19, 2007 #1
    http://img175.imageshack.us/img175/2448/picture1wt8.png [Broken]

    I am having trouble deciding when to use the static and kinetic frictions and what to do about this problem. Thanks for any help!
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Feb 19, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    If the surfaces slip, then you have kinetic friction; if they don't, it's static friction.

    Start by figuring out if it's possible for the block to not slip on the slab.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook