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Help with a torque question

  1. Mar 28, 2009 #1
    1. The problem statement, all variables and given/known data
    A garden cart loaded with firewood is being pushed horizontally when it encounters a step 8.0 cm high, as shown in the figure. The mass of the cart and its load is 64 kg, and the cart is balanced so that its center of mass is directly over the axle. The wheel diameter is 60 cm. You are pushing the cart horizontally by a handle.


    2. Relevant equations
    torque = rFsin(angle)
    Newton's laws



    3. The attempt at a solution
    I tried to find the torque that occurs as a result of the step applying a force on wheel. I originally thought that the force the person was applying was equal to the force that the wheel applied to the step. Thus, since the step is 8 cm high, I thought that the torque due to the step was .30(F)sin(74.5). But I am having trouble figuring out if this is equal to zero or something else?
     
  2. jcsd
  3. Mar 28, 2009 #2

    LowlyPion

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    Homework Helper

    Welcome to PF.

    What is the question?
     
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