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Frictional force question

  1. Sep 23, 2009 #1
    A small girl applies a horizontal force of 2 Newtons to a 10-Newton box which slides
    across the floor with a constant speed of 3 m/s. What is the frictional force, in Newtons,
    by the floor on the box?


    F=ma


    The correct answer is 2 but I don't understand why. If the horizontal force is 2 and the frictional force is 2, wouldn't the box not slide? Indicating that the velocity is constant means that there is no acceleration correct?
     
  2. jcsd
  3. Sep 23, 2009 #2

    rl.bhat

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    Homework Helper

    If the frictional is the maximum force which is needed to start the motion. If the applied force is just equal to the frictional force, the body will move with uniform velocity.
     
  4. Sep 23, 2009 #3
    oh! thank you!
     
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