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Homework Help: Help on calculating Mk

  1. Nov 19, 2004 #1
    Help on calculating Coefficent of kinetic friction

    Here is the problem: A box of books weighing 325 N moves with a constant
    velocity across the floor when it is pushed with a force of 425 N exerted downward at an angle of 35.2 degrees below the horizontal. Find the Coefficent of kinetic friction between the box and the floor.

    Thanks for the help!
    Last edited: Nov 19, 2004
  2. jcsd
  3. Nov 19, 2004 #2

    James R

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    1. Draw a vector free body diagram showing all forces acting on the box.
    2. Since it is moving at constant velocity the net force must be zero.
    3. Resolve forces horizontally and vertically to get two equations. Remember that the friction force is [itex]\mu N[/itex], where [itex]\mu[/itex] is the coefficient of friction and [itex]N[/itex] is the normal reaction force.
    4. Solve your two equations simultaneously to find [itex]\mu[/itex].
  4. Nov 20, 2004 #3


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    Hey! I'm Mk!
  5. Nov 20, 2004 #4
    hahaha :rofl:
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