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Pushing Against Friction

  1. Oct 25, 2007 #1
    1. The problem statement, all variables and given/known data

    A man pushes a heavy box. The mass of the box is 100kg. There is friction between the man and the floor; the frictional force is 150N. As the mas pushes hard, the box accelerates with acceleration 0.3m/s/s. Calculate the force F exerted by the man on the box.

    2. Relevant equations

    F = ma

    3. The attempt at a solution

    Does the man need to at least exert 150N to overcome the force of friction? I don't know how to attempt the problem.
     
    Last edited: Oct 25, 2007
  2. jcsd
  3. Oct 25, 2007 #2

    Doc Al

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    Staff: Mentor

    Absolutely. If you drew a diagram of the situation (always a good idea), what horizontal forces would you show acting on the box? Apply Newton's 2nd law to the box.
     
  4. Oct 25, 2007 #3
    So the answer would be 180N, correct?
     
  5. Oct 25, 2007 #4

    Doc Al

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    Staff: Mentor

    Correct.
     
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