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Homework Help: Static and kinetic friction

  1. Sep 24, 2007 #1
    1. The problem statement, all variables and given/known data
    A block whose weight is 30.0 N rests on a horizontal table. A horizontal force of 48 N is applied to the block. The coefficients of static and kinetic friction are 0.650 and 0.420 N, respectively. Will the block move under the influence of the force, and, if so, what will be the block's acceleration?

    2. Relevant equations

    force of static friction = mu x normal force = ma
    force of kinetic friction = mu of k x normal force

    3. The attempt at a solution

    i understand how to use both the static and kinetic frictions...but how do i connect the two to answer this question?
  2. jcsd
  3. Sep 24, 2007 #2


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    Homework Helper
    Gold Member

    You must know SOMETHING about how to set this problem up. How would the applied force have to relate to static friction force if the block started to move?
    Last edited: Sep 24, 2007
  4. Sep 24, 2007 #3
    Draw the forces acting on the block, when it is pushed and try getting your equations from there.
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