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Inclined Planes; Finding Force of Friction

  1. Jul 9, 2008 #1
    1. The problem statement, all variables and given/known data
    A 275 N box is sliding down a frictionless inclined plane. If the incline makes an angle of 30.0 degrees with the horizontal, what is the acceleration along the incline?

    I dont need to know how to figure out the solution to this problem - yet, atleast.
    Im trying to figure out how to find the Force of friction.
    Could anyone help me out on this?

    Through my calculations, i have determed:
    Fg = 275 N
    F[Parallel] = 157.73 N
    mass = 28.03 kg
  2. jcsd
  3. Jul 9, 2008 #2
    The force of friction is defined to be [tex]\mu \mathbf{N}\text{ where } \mu \text{ is the frictional constant and } \mathbf{N}[/tex] is the normal force. But there is of course no friction involved in this problem.
  4. Jul 9, 2008 #3
    Im trying to figure it out without that formula..
  5. Jul 9, 2008 #4
    Hmm, I'm confused as to what you're asking then.
  6. Jul 9, 2008 #5


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    Homework Helper

    If they say that the surface is frictionless, that means that the frictional force is zero.
  7. Jul 9, 2008 #6
    Ah crap. i think i might have posted the question above the question i actually needed. But k nvm i figured out the answer :) Thanks anyways guys
  8. Jul 9, 2008 #7
    No problem at all.
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