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Inclined Plane with Friction

  1. Oct 11, 2009 #1
    1. The problem statement, all variables and given/known data

    A block of mass m = 39 kg is slid over a horizontal frictionless surface at some constant velocity. It then encounters a inclined plane which has a coefficient of kinetic friction of 0.39. The inclination angle for the incline is x = 34.6 degrees and the height of the incline is h = 23.8 meters above its base. If the magnitude of the velocity at the top of incline is 34 m/s for the block, what was the magnitude of its velocity at the bottom of the incline in m/s?

    /scratches head

    For this one, I really have no idea how to begin. Any help would be really appreciated. Thanks.
     
  2. jcsd
  3. Oct 11, 2009 #2

    CompuChip

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    You can reduce this formula to the type of question where mass m and force F are given, and they ask you to calculate a change in velocity (how would you do that in general, forgetting about where the F comes from?).

    While the block slides up the ramp, two forces act on it (which ones?). Then what is the F that I mentioned in the first paragraph (hint: decompose in components along and perpendicular to the plane).
     
  4. Oct 11, 2009 #3
    To find a change in velocity- Vf2 = Vi2 -2g delta y, or Vf = Vi - gt?

    When the block slides up, a normal force and a weight force are being acted upon it right?
     
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