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Friction Problems: Need Help

  1. Nov 3, 2009 #1
    1. The problem statement, all variables and given/known data
    A sled of mass 13.4 kilograms is pulled along flat snow-covered ground. The static friction coefficient is 0.334, and the kinetic friction coefficient is 0.111.
    I solved both part a and b, but im having trouble with part c.
    c. Once moving, what force is needed to accelerate the sled 2.69 meters per second per second?



    2. Relevant equations
    am=f
    u=f/n


    3. The attempt at a solution

    Im confused on how to do this.
    So Its asking for the force pushing the sled forward. Using the formula am=f
    if i plug in acceleration and the mass i get 13.4x2.69=36.046, but it said it was wrong.
    Am I missing something? Do I need to factor in frictional force?
    Would I add 14.6 to 36.046? 14.6 is the force needed to push the object at a constant velocity.
     
  2. jcsd
  3. Nov 3, 2009 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    Do a freebody diagram of the accelerating sleigh. What are the forces acting on the sleigh? What do they necessarily sum to?

    AM
     
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