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Homework Help: Inclined Plane and cart

  1. Apr 28, 2010 #1
    1. The problem statement, all variables and given/known data
    How do you find the effort force of pulling a cart up a ramp with no friction and you know that the weight of the cart is 7.6734 N?


    2. Relevant equations
    W=F[tex]\Delta[/tex]Xcos[tex]\theta[/tex]
    Efficiency=(work output / work input) x 100

    3. The attempt at a solution
    My main goal is to compare the efficiency of an ideal frictionless machine (the ramp) to the efficiency of a ramp with friction that I already have the calculations for.
    However my efficiency for the frictionless ramp is less than the efficiency for on with friction. Could this be right?
    When I'm solving the work equation in order to get the work input and output I use 7.6734 for the force. Is this right?
     
  2. jcsd
  3. Apr 29, 2010 #2
    When you calculate work done from a constant force, you need only think about the force component parallel to the line of motion. What is the forcecomponent parallel the to inclined plane?
     
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