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Homework Help: Coefficient of Friction & Restitution

  1. Feb 16, 2012 #1
    1. The problem statement, all variables and given/known data
    If a ball strikes a surface with an input velocity of 18m/s, incident angle 25 degrees, mass = 2.5kg, Coefficient of restitution 0.8 and Coefficient of friction 0.6 how would you calculate the output velocity and angle? I can work it out with restitution only but how do you factor in friction?

    2. Relevant equations

    3. The attempt at a solution Without friction
    2.5x18cos 25 = 2.5 x Vcosσ
    Vcosσ = 16.3

    -Vsinσ = -CoR(18sin25)
    Vsinσ = 6.09

    Relating V and σ gives
    σ=20.5 degrees
  2. jcsd
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