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Calculating acceleration of plane when given mass, friction force and Vi

  1. Jan 26, 2016 #1
    1. The problem statement, all variables and given/known data
    A 2000 kg plane is landing at an airfield with an initial speed of 50 m/s. The force of friction is 1/4 the weight of the plane. What is the acceleration of the plane?

    2. Relevant equations

    Fnet = ma

    Fnet = something - ff

    3. The attempt at a solution

    2000a = thing I don't know - ff, which is 500 n

    So

    2000a = ? - 500N

    What force am I missing?
     
  2. jcsd
  3. Jan 26, 2016 #2

    haruspex

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    Why are you convinced you are missing a force?
     
  4. Jan 26, 2016 #3

    SteamKing

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    You're missing the fact that 500 N is ≠ 1/4 of the weight of the plane. Remember, 2000 kg is the mass of the plane, not its weight.
     
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