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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.


    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:

    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


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    Gold Member

    you meant to say 37 kg
    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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