1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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


    User Avatar
    Homework Helper

    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


    User Avatar
    Homework Helper

    you have

    Fa+Fb= constant


    Fa-Fb= other constant

    two equations with two unknowns, solve simultaneously.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook