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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.
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