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Frictional force

  1. Oct 11, 2008 #1
    1. A force of 800N parallel to the plane is applied to a 100kg block on the plane to push it up the plane. If the component of the weight down the incline plane is 500 N, what is the frictional force?

    2. Frictional force = u.Normal Force

    3. Fi = Wx + Ff
    Ff = Fi - Wx
    Ff = 18 N
    Last edited: Oct 11, 2008
  2. jcsd
  3. Oct 11, 2008 #2


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    Welcome to PF!

    Hi emilyn! Welcome to PF! :smile:

    Nooo … frictional force = normal Force times coefficient of friction (µ).

    (or µ = frictional force/normal force :wink:)

    Try again! :smile:
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