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Homework Help: Force on lawnmower problem

  1. Apr 20, 2010 #1
    1. The problem statement, all variables and given/known data
    I could really do with some feedback here. I've tried a solution but I'm unsure about the answers i got, especially in the second part.

    http://www.mediafire.com/?r0mcmwjylt0 [Broken]



    2. Relevant equations

    P = µFx = Max ∑MB = ∑Mad
    V = U + at

    3. The attempt at a solution
    Taking X in the horizontal direction and Y in the vertical. µ = Friction factor d = distance vertically to G a= acceleration.
    Force P = µFx = Max ∑MB = ∑Mad = 30(9.81)x(0.2)=30a(0.2)
    58.86=6a
    a=9.81 m/s2
    µFx = Max 0.5Fx = 30(9.81) Fx = 590N
    V after 5 sec: V = U + at = 0 + (9.81)5 V=49.05 ????? - seems too fast!
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
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