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Homework Help: Mass of an object up inclined plain

  1. Jul 15, 2009 #1
    applied all the force FR=1008N that I could to the (massless, unstretchable) rope in an effort to pull Brisket into the trailer, up the ramp that formed an angle of 24.0° with the ground. Brisket moved down the ramp with an acceleration of magnitude 0.29m/s2. With this information, and assuming the ramp is frictionless, what is Brisket's mass (in kg)?

    What i have done so far is Fn = mg cos (angle) and that is 1008/ 9.8cos 24(degrees)= 112.59 kg but it is not correct can anyone direct me into the right direction

    Much appreciated
  2. jcsd
  3. Jul 15, 2009 #2
    You're trying to pull the object UP the ramp, but it's moving DOWN. Draw a free body diagram!
  4. Jul 15, 2009 #3
    The equation should be
    mg*sin(24)(downward force) - FR = ma
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