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Friction (angle of incline)

  1. Jul 27, 2010 #1
    Hey would someone mind taking a crack at this one? I know the final answer is 28.73, however I can't figure out the equation to get it.

    On a certain inclined plane, a body weighs 50N and requires a force of 35N to pull it up the incline. If the coefficient of friction is 0.25, find the angle of the incline.
     
  2. jcsd
  3. Jul 27, 2010 #2

    Doc Al

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    Staff: Mentor

    Why don't you take a crack at it?

    Call the angle θ and analyze the forces acting on the body as it is pulled up the incline.
     
  4. Jul 27, 2010 #3
    at what angle is the force being applied?
     
  5. Jul 27, 2010 #4
    well, first you need to remember that the weight (50N) is directed downwards, but the force of friction needs the weight applied PERPENDICULAR to the surface. Find this, then you will get your angle.
     
  6. Jul 28, 2010 #5
    parallel
     
  7. Jul 28, 2010 #6
    no. you must have misunderstood.
    I meant the angle perp. multiplied by the coeff. of friction will give u your force countering the 35N (which is assumed to be equal). so fill in the blanks to find the angle.
     
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