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Friction Force

  1. Oct 10, 2014 #1
    1. The problem statement, all variables and given/known data
    If a 2.5 kg rubber ball is rolled across the dry concrete floor with an acceleration of 4.0 m/s^2[E]. Determine the friction force required to stop the ball. (Drawing a free body diagram will help illustrate this situation)

    2. Relevant equations
    Fk= µk(Fn)
    F=ma


    3. The attempt at a solution

    a=4.0 m/s^2[E]

    m=2.5kg
    µk= 1


    Find Fn=mg

    =2.5(9.81)

    =24.5

    Find friction force to stop the ball


    Fk=1(24.5)

    Fk=24.5

    Find Fnet=ma

    =2.5(4.0)

    =10 N(E)
    These numbers are telling me that the object should not be moving in the first place? Which is confusing because i am given an acceleration

     
  2. jcsd
  3. Oct 10, 2014 #2

    RUber

    User Avatar
    Homework Helper

    Why did you set ##\mu k = 1##?
     
  4. Oct 10, 2014 #3
    that was the value that was given to me, on my coefficients of friction sheet.
     
  5. Oct 10, 2014 #4

    462chevelle

    User Avatar
    Gold Member

    That is very high, that is a friction i would expect to be static. and i thought rubber to concrete was somewhere around .8 mus
     
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