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Incline Plane

  1. Nov 2, 2007 #1
    1. The problem statement, all variables and given/known data
    A mass, m2, on a 30[tex]^{o}[/tex] slope is connected to another mass, m1, by a light string that passes over a frictionless pulley, as shown. The two masses are equal, the slope is smooth, and the acceleration due to gravity is g.
    What is the scalar equation for mass m2, that correctly shows the relationship between the acceleration, a, of the mass and the tension in the string, FT?


    2. Relevant equations
    F = ma

    3. The attempt at a solution
    I got sin 30[tex]^{o}[/tex] = [tex]m_{1}[/tex]g - FT/[tex]m_{2}[/tex]a - [tex]m_{2}[/tex]g. However, this is wrong. The answer is supposed to be FT - m2g sin30[tex]^{o}[/tex] = m2a.

    Can someone show me where I went wrong please?
  2. jcsd
  3. Nov 2, 2007 #2

    Chi Meson

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    What two unbalanced forces are on m2?

    what is the acceleration of m2 due to the net unbalanced force on m2?
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