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Homework Help: Elevator and scale problem

  1. Mar 19, 2013 #1
    1. The problem statement, all variables and given/known data

    Harold has a mass of 72.2 kg, and is standing on a scale in an elevator cab. What will the scale read if the elevator is moving downwards at a constant 0.050 m/s?

    2. Relevant equations

    3. The attempt at a solution

    Since the scale has a normal force upward and Harold has an identical normal force downward (assuming this is correct). Well that means that the only thing affecting the scales weight is the mass * acceleration correct?

    A free body diagram showed ma downward and I'm not sure if I was suppose to draw anything else (I drew the normal force but wasn't sure if it was equal to anything)

    In a separate attempt the weight = mg

    so W = 72.2 * 9.8 = 708N

    *EDIT = I didn't realize that the acceleration is 0 since velocity is constant until now
    Last edited: Mar 19, 2013
  2. jcsd
  3. Mar 19, 2013 #2


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