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!

Newton's Laws of Motion

  1. Sep 21, 2010 #1
    1. The problem statement, all variables and given/known data
    T
    here are 2 blocks connected by a string, as shown in the first image attached. The smooth inclined surface makes an angle of 40 degrees with the horizontal, and the block on the incline has a mass m1 = 7.9kg. What is the mass of the hanging block m2 that will cause the system to be in equilibrium.


    2. Relevant equations

    [tex]\sum[/tex]F = ma
    then find the components...

    3. The attempt at a solution

    I know that I have to set up a free body diagram then break everything up into components. I also know that objects in equilibrium do not accelerate. But I can't figure out how to find the one mass. What equation would I use or what would I set things equal to?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Sep 22, 2010 #2
    Since the bodies are in equilibrium, they dont accelerate. Which means that the rope is keeping them still.
    The tension in the rope is thus equal to the weight of m2. This is the equilibrium condition for m2.
    Now try to right the condition up for m1. (i.e. the tension in the rope is equal to ...).
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Newton's Laws of Motion
Loading...