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A Frictionless Ramp Problem

  1. Oct 20, 2009 #1
    1. The problem statement, all variables and given/known data
    A 100kg crate is pushed at a constant speed up a frictionless 30 degree inclined ramp. What constant horizontal force is required? what force is exerted on the crate by the ramp?


    2. Relevant equations
    Fg parallel= mgsin(theta), Fg Perpindicular=mgcos(theta), Constant speed-->a=0m/s2


    3. The attempt at a solution
    Fg=mg
    =9.8x100
    =980N
    Fg parallel=980sin(30)
    =490N

    Fg perpindicular= 980cos(30)
    =849N

    I have no idea what to do next! Please help me out here if you can! Any contribution appreciated!!!!!!
     
  2. jcsd
  3. Oct 20, 2009 #2

    Delphi51

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    Homework Helper

    Welcome to PF, Evil!
    The push must equal the parallel (down the ramp) component.
    The block pushes on the ramp (straight in) with the perpendicular component. No more calcs to do!
     
  4. Oct 20, 2009 #3
    Thanks for the welcome! And the guidance on this question! Looks like these forums could come in really handy in the next little while!
     
  5. Oct 20, 2009 #4

    Delphi51

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    Homework Helper

    Indeed! Be sure you don't miss out on the struggle part - give it a darn good try yourself before posting. We're here to save you from wasting time but we must not prevent you from learning in the struggle.
     
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