1. Not finding help here? Sign up for a free 30min 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!

Resultant of multiple forces

  1. Feb 5, 2008 #1
    1. The problem statement, all variables and given/known data

    Two horizontal forces act on a 3.5 kg chopping block that can slide over a frictionless kitchen counter, which lies in an xy plane. One force is F1 = (3.1 N) + (7.8 N). Find the acceleration of the chopping block in unit-vector notation when the other force is (a) F2 = (-3.1 N) + (-7.8 N), (b) F2 = (-3.1 N) + (7.8 N), and (c) F2 = (3.1 N) + (-7.8 N).

    2. Relevant equations


    3. The attempt at a solution

    I feel like I want to add vectors but I do not know where the mass comes into play other than in the equation F=ma
  2. jcsd
  3. Feb 6, 2008 #2
    Go with your feeling!

    Use vector addition to get a single force on the board then use F = ma (more correctly the vector equation F = ma)
  4. Feb 6, 2008 #3
    So the resulting force for a would be 3.1-3.1 which is 0 and then 7.8-7.8 which is 0. so? the resultant force is 0i+0j. But how would i use this in the F=ma formula
  5. Feb 6, 2008 #4
    Rearrange as
    a = F / m
    then substitute your resultant force.
  6. Feb 7, 2008 #5


    User Avatar
    Homework Helper

    F = ma = mai + maj = 0i + 0j
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Resultant of multiple forces
  1. Resultant Force (Replies: 9)

  2. Resultant Force (Replies: 9)

  3. Resultant Force (Replies: 4)

  4. Resultant Forces (Replies: 3)