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!

Newtons Law problems

  1. Nov 6, 2008 #1
    here is my 4 problems.

    attached is my attempt at #2....any input would be great.

    Attached Files:

  2. jcsd
  3. Nov 6, 2008 #2
    are these images viewable...it'd be a pain to type out the problems.
  4. Nov 7, 2008 #3
    ok here are my solutions to all four problems....if anyone can take a look i would love it.


    Attached Files:

  5. Nov 8, 2008 #4


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    You shouldn't be looking at the system of 3 masses together, because it is confusing to identify the "net' force acting, and if by chance you get the right combination of forces, the solution is not in the spirit of Newton's 2nd Law. Instead, look at each mass separately, identify the forces acting on each, and use Newton 2 on each. You're going to have to do this anyway to find the tensions. You'll end up with 3 equations which you can solve for the 3 unknowns, T1, T2, and 'a'. I also note that your forces on mass 3 are not directed in the proper direction, although you seem nonethelseess to have correctly identified the forces acting up the plane.
  6. Nov 8, 2008 #5
    and #4
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Newtons Law problems