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Physics; two forces on an object

  1. Sep 22, 2009 #1
    1. The problem statement, all variables and given/known data

    Two forces FA and FB are applied to an object whose mass is 16.0 kg. The larger force is FA. When both forces point due east, the object's acceleration has a magnitude of 0.900 m/s2. However, when FA points due east and FB points due west, the acceleration is 0.400 m/s2, due east. Find the magnitude of FA and the magnitude of FB.

    2. Relevant equations



    3. The attempt at a solution

    well Fnet= Fa+Fb= ma
    so Fnet = 16*0.9
    Fnet= 14.4
    now what do i do?
     
  2. jcsd
  3. Sep 22, 2009 #2

    rock.freak667

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    When both are in the same direction

    Fa+Fb=ma (a = 0.9)

    when in opposite directions Fa-Fb=ma, this a is in the second line of the problem
     
  4. Sep 22, 2009 #3
    yes so Fa+Fb=14.4 how do i find the value of each one?
     
  5. Sep 22, 2009 #4

    rock.freak667

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    you have


    Fa+Fb= constant

    and

    Fa-Fb= other constant


    two equations with two unknowns, solve simultaneously.
     
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