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Help with free fall and newtons second law problem

  1. Feb 12, 2016 #1
    1. The problem statement, all variables and given/known data
    Using Newtons second law, if an object with mass M is free falling (the only F acting upon it is its own weight), calculate the object's acceleration. What would happen to its acceleration should its mass duplicate?

    2. Relevant equations
    F=ma

    3. The attempt at a solution
    So since the object is free falling its acceleration is = to g. And that should be my answer right?
    Could I just do
    F=mg
    mg=ma
    g=a?
    or is that just wrong?

    then if the objects mass duplicates its acceleration stays the same because its constant? so the objects mass is irrelevant to its acceleration, right??
     
  2. jcsd
  3. Feb 12, 2016 #2

    cnh1995

    User Avatar
    Homework Helper

    Right! If I remember correctly, that's exactly what Galileo proved by dropping two different masses from the Tower of Pisa..
     
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