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Pushing a Box On A Plane 30deg Plane Help?

  1. Oct 6, 2008 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations


    3. The attempt at a solution


    Parallel force

    Perpendicular force To Plane

    Figured out that the man is pushing with a force of

    Normal Force
    Wouldn't it be the opposite to the perpendicular force? 471.512? But this is wrong??? HELP. What other force in the perpendicular direction am I missing?
  2. jcsd
  3. Oct 6, 2008 #2


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    Homework Helper

    OK you have the weight of the box perpendicular and parallel ok.

    Now the man is pushing with a force that has 2 components too. Since it is at rest, you correctly balanced the downward plane force of the box with the upward plane force from the man and part b) looks correct.

    For the last one there are two normal forces to the ramp. The gravity related component added to the Sin30 component of the man pushing .
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