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Homework Help: Pulley problem with 2 masses and an incline

  1. Oct 3, 2015 #1
    1. A mass on a flat surface is pulled with an angled force of 200N (as shown) and is connected by a massless rope/pulley to another mass below on an incline. Find the acceleration and Tension in the rope.

    2. Relevant equations
    Fnet = ma
    Fg = mg
    Ff = Mu x Fn

    3. The attempt at a solution
    Had a question like this except with different masses/angles on a quiz and wanna make sure I did it right.

    Would the equation for M1 be Fnet = Fappx - Ft - Ff

    And for M2:
    Fnet = Ft - Ff - Fgx

    And then you turn Fnet into ma, combine the two equations to make Ft cancel out, then solve for a since acceleration is the same for both masses in a pulley system?

    Here's a pic of the problem: (won't let me upload from my phone)


    Mentor's Note: Here's a visible version:
    Last edited by a moderator: Oct 3, 2015
  2. jcsd
  3. Oct 3, 2015 #2
    Yes. This looks right.
  4. Oct 3, 2015 #3
    Great! And for the normal force on M1 (to figure out friction), would it be M1g - 200sintheta ?
  5. Oct 3, 2015 #4


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    Yes. But you have not said what you mean by Fgx and Ff for M2.
  6. Oct 3, 2015 #5
    Oh, I meant Fgx is the x component of the force of gravity so (mgsin30) and Ff is = Fn which is equal to the y component of Fg so Ff = (0.2 x mgcos30)
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