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Homework Help: Minimal Force question

  1. Dec 1, 2008 #1
    1. The problem statement, all variables and given/known data

    A 20 kg block is on a surface where the coefficient of friction is 0.30. Find the minimal force needed to have the block more slowly at a constant speed.

    3. The attempt at a solution

    So I did coefficient of friction(mass)(gravity)=frictional force
    20(0.3)(9.8)=58.86 N is the frictional force

    Now is the minimal force needed to move the block like 58.87?
  2. jcsd
  3. Dec 1, 2008 #2
    Yes, for the block to be moving at a constant velocity (by Newton's 1st Law), friction = force applied on block. Hence your answer is absolutely correct.
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