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Homework Help: Net work calculation problem

  1. May 31, 2015 #1
    1. The problem statement, all variables and given/known data
    a box is pushed horizontally across a floor with a force of 70 N to the right. There is a friction force also acting on the box in the opposite direction of 18 N. if the box is displaced 8 meters. what is the net work done on the box?

    2. Relevant equations
    W(net)= Fd cos (theta)

    3. The attempt at a solution
    the net forces on the box in the horizontal direction is= 70N - 18N= 52N to the right
    Since its moving horizontally, which is 0 degrees. and im given displacement as 8 meters, and the force calculated above:

    w(net)= (52N)(8m) cos (0)
    = 416 joules

    Does this look right?
  2. jcsd
  3. May 31, 2015 #2
    Yeah its look like right
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