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Newton's Second Law Problem

  1. Oct 9, 2013 #1
    1. The problem statement, all variables and given/known data
    There is an attachment of a FBD, and you have to solve for the following:
    Fg=?
    Fnet?
    Mass=?

    3. The attempt at a solution
    I know you will have to equate equations, but I dont know how to go about doing this.
    I do know that Fg= m x 9.8, I isolated various equations and subbed them into each other and got no answer.
     

    Attached Files:

  2. jcsd
  3. Oct 9, 2013 #2
    Remember that the net force = mass X acceleration.
    You have the acceleration, you have the two forces acting on the mass, and mass m.

    You are almost there.
     
  4. Oct 9, 2013 #3
    Fnet=ma
    -Fg+F=ma
    -9.8m+110 = m
    -10.8m=-110
    m=10.2kg

    Fnet=-Fg+F
    =-9.8m+110
    =-9.8(10.2)+110
    Fnet=10.04N

    a= Fnet/m
    a=10.04/10.2
    a=0.98 m/s/s

    Is this correct?
     
  5. Oct 9, 2013 #4
    Looks good. However, you might use some more significant digits as the last part, a should be 1.0 as given.
     
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