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Homework Help: Need help With Friction Problem

  1. Oct 20, 2005 #1
    I am not getting forces at all. I 'm not sure of what to do. Here's the question:

    A box is resting on a flat surface. The box has a mass of 20KG and a force of 200N is pushing the box to the right. The force of friction acting on the box is 100 N to the left. What is the acceleration of the box?

    I know that the sum of the forces=Mass X Acceleration. But im not sure what numbers to put in.
  2. jcsd
  3. Oct 20, 2005 #2

    Chi Meson

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    Consider the forces that act along the line of motion (left-right forces that is , the box is not moving up or down is it?). Call forces to the right "positive. Call forces to the left "negative." What is the sum of all the left-right forces? (Hint: it involves a little mathematical trick called "subtraction.")
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