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Coefficient of friction (between road and wheels of accelerating truck)

  1. Mar 27, 2010 #1

    pmp

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    1. The problem statement, all variables and given/known data
    What is the coefficient of friction between the road and the wheels of a 1400kg truck accelerating at 2 m/s/s if the force applied by the engine to the wheels is 4000N.


    2. Relevant equations
    Fn = m * g
    Ff = mu * Fn


    3. The attempt at a solution
    I do not know how to resolve this as I don't know Ff or mu (i.e. two variables)
    Any asisstance (not answer) would be appreciated.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 27, 2010 #2

    rock.freak667

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    Homework Helper

    First draw a free body diagram.

    Then find the resultant force in the horizontal (x) direction.

    Newton's 2nd Law states that ∑Fx= ma
     
  4. Mar 27, 2010 #3

    pmp

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    thanks rock.freak667,
    I have found the answer it was on a website called http://www.physics247.com/physics-homework-help/friction-and-weight.php" [Broken] the answer was 0.09 as is shown here:

    mu = Ff/Fn
    Ff = (ma) - Fengine
    mu = ((ma) - Fengine)/-(mg)
    mu = ((1400 * 2) - 4000)/-(1400 * 9.81)
    mu = (2800 - 4000)/-13734
    mu = -1200/-13734
    mu = 0.085...
    mu = 0.09
     
    Last edited by a moderator: May 4, 2017
  5. Mar 27, 2010 #4

    rock.freak667

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    Homework Helper

    Once you understand the thinking process, as that will allow you do similar problems or slightly more complex ones.
     
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