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Finding Minimum Force

  1. Sep 21, 2009 #1
    1. The problem statement, all variables and given/known data
    A sled is pulled over a horizontal surface where the kinetic coefficient of friction is .20. What is the minimum force necessary to keep the sled moving if its mass is 2 slugs?

    2. Relevant equations
    fs = Ns(mg)

    3. The attempt at a solution
    fs = (.20) (2 slugs) (32)

    This problem has got me stumped. Please help! Thank You.
  2. jcsd
  3. Sep 21, 2009 #2


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    What is the unit of fs?
  4. Sep 21, 2009 #3
    I assume 12.8 N
  5. Sep 21, 2009 #4


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    Unit force is N if mass is in kg.
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