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I dont know if this is advanced or not but help needed

  1. Mar 4, 2007 #1
    someone is puchsing a box across a floor at a constant velocity. The coefficient of kinetic friction is .41. THe pushing force is directed downward at an angle below the horizontal. If the angle is greater then a certain value then no matter the force the box can not be moved. What is this angle.

    I really have no clue where to start
     
  2. jcsd
  3. Mar 4, 2007 #2
    Here's a tip:

    First you need to draw a force diagram for the box and from there, solve for the Normal Force. Is the magnitude of the force on the box given in the problem?
     
  4. Mar 4, 2007 #3

    mjsd

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    Homework Helper

    then think about under how the net force of the system may becomes zero (ie. box doesn't accelerate)
     
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