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Math Help - Physics friction

  1. #1
    Junior Member
    Joined
    Dec 2008
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    Physics friction

    1. The problem statement, all variables and given/known data
    Find the normal force on an object, 80kg, which is being pulled up by a force of 4000N at an angle of: A) Up at 50 degrees. B) Down at an angle of 70 degrees.


    2. Relevant equations
    Fw = mg
    Fsinx
    Fcosx

    3. The attempt at a solution

    A) Fn = 784 - 4000sin50 = -2280 = 2280N


    B) Fn = 784 + 4000sin70 = 4543N

    Is this correct?
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  2. #2
    Member arpitagarwal82's Avatar
    Joined
    Feb 2009
    Posts
    103
    If F is force applied at an angle x with horizontal then, normal force (N) component and horizontal force (H) component can be calculated as  N = F * \sin(x) and H = F * \cos(x)

    refer to attachment

    Now just replace the value of F and angle x (remember its angle which forca makes with horizontal)
    .
    Attached Thumbnails Attached Thumbnails Physics friction-2.jpg  
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