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: Force equation

  1. May 1, 2012 #1
    1. The problem statement, all variables and given/known data
    Hi,
    i need to write the differencial force equation for the system attached,
    and i am not sure if what i do is right.

    when:
    F- externa power
    m1,m2 - mass
    x1,x2 - mas location

    3. The attempt at a solution
    This is what i got:
    for m1:
    F-k*(x1-x2)-D*(x1'-x2')=m*x1''
    for m2:
    k*(x1-x2)+D*(x1'-x2')=m*x2'

    what do you think?
    thanks!
     

    Attached Files:

    • 1.JPG
      1.JPG
      File size:
      9.7 KB
      Views:
      99
  2. jcsd
  3. May 1, 2012 #2
    Looks fine except you left of the double prime for acceleration on the second equation.
     
  4. May 2, 2012 #3
    ok, thanks!
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook