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Homework Help: Finding Gravity Constant

  1. Jan 29, 2008 #1
    1. The problem statement, all variables and given/known data

    So I need to find the values for local acceleration and frictional force due to a pulley system using the equation below. After graphing acceleration for various ∆mass vs acceleration using Excel, I get the following equation:
    y = 0.0144x - 0.0875

    I don't understand what the slope and y intercept in this equation represent though, how can I use them to find the 'local acceleration and frictional force'?

    2. Relevant equations

    a = (∆m/TOTAL MASS)g - (f/TOTAL MASS)

    where f = frictional force

    3. The attempt at a solution

    I think I'm supposed to get the gravity constant from the linear equation, but not sure how. Obviously it's not 0.0144.
  2. jcsd
  3. Jan 29, 2008 #2


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    Homework Helper

    What did your setup look like?

    A hanging load (mass ∆m) pulling a trolley (string passing over pulley) with constant mass (mass m) horizontally? So that TOTAL (ACCELERATING) MASS = ∆m + m?
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