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Finding Minimum Force Applied to Keep Objects Stationary?

  1. Dec 9, 2013 #1

    The coefficient of static friction between the crate m1=3.00kg and the incline with θ=35° shown in the figure below is .300. What minimum force F must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline?


    mgsinθ
    μsmgcosθ
    f=ma

    I don't quite get how the applied force fits into the equation. mgsinθ-μsmgcosθ+F=0?
     

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  2. jcsd
  3. Dec 9, 2013 #2
    Your equation is almost right. You are not interested so much in F itself but the additional frictional force caused by F.
     
  4. Dec 9, 2013 #3
    Okay thank you I got it!
     
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