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Finding normal force acting on an object (Fn)?

  1. Nov 12, 2011 #1
    1. A couch with a mass of 100 kg is placed on an adjustable ramp connected to a truck.If the couch slides down the ramp with an acceleration of 0.8 m/s^2:

    2. find the normal force on the couch

    3. my way:
    Fg=m*9.81=981
    Fnety=0N
    981 sin 270+f sin 180+Fn sin 90=0N
    -981Fn=0
    Fn=981
    my ans is wrong

    hint:the ans shold be (Fn=959.6N)
     
  2. jcsd
  3. Nov 13, 2011 #2

    rude man

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    Hmm - I get Fn = ma*cot[arc sin(a/g) = 977.73 N

    Assumes frictionless plane
     
    Last edited: Nov 13, 2011
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