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Homework Help: Inclined Plane

  1. Jun 13, 2007 #1
    1. The problem statement, all variables and given/known data

    Alright for this thing, we had to pull a cart up a inclined plane and time how long it took to get to the bottom.

    Distance from ground to top of inclined plane is - 0.125m
    Length of Board is - 1.21m
    Mass of cart - 1.09kg
    Force to pull cart up - 1.4N
    Time it took for cart to roll down board - 1.92s

    So I need to calculate:
    Energy Input (pulling cart up)
    Energy Output

    2. Relevant equations

    W = Fd

    Eff = Useful output energy/Input Energy x 100%

    3. The attempt at a solution

    So im guessing Energy Input is
    W = 1.694 J

    Would Energy output be
    E = 1/2mv^2?
  2. jcsd
  3. Jun 13, 2007 #2


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    I don't think so, wouldn't that be counting your losses twice? It takes 1.7 joules of input energy (Work) to pull the cart up to the top of the plane. How much energy does it have when it gets there?
    Last edited: Jun 13, 2007
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