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Force on an incline

  1. Oct 28, 2008 #1
    1. The problem statement, all variables and given/known data
    Two blocks are connected by an extensible massless cord on an inclined plane as shown in the figure below.

    [​IMG]


    What is the tension in the cord pulling the lower block?
    What is the force pulling both the blocks?

    When I try to solve for tension 1st, I'm getting a negative answer... Here's my FBDs:
    http://i210.photobucket.com/albums/bb23/Kyashii628/fb.jpg

    My equations: for the 15 kg
    T- Fgx= ma
    T-314.0208114= 114.7 N
    T= -199.3208114 N

    Can someone tell me what I did wrong? Is the Fgx supposed to be pointing down the ramp instead of up the ramp?
     
  2. jcsd
  3. Oct 28, 2008 #2

    PhanthomJay

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    Science Advisor
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    Gold Member

    you meant to say 37 kg
    good
    you have your sines and cosines confused; Fgx is not mgcos30;what should it be?
    correct your error and the result should be fine (even with the error, the T comes out positive...check your algebra).
    yes it points down, which you have correctly noted...just correct the value of it.
     
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