1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Acceleration of two masses on a pulley

  1. Jun 26, 2010 #1
    1. The problem statement, all variables and given/known data
    Find the acceleration of the block on the left in terms of M, m and g.
    See attachment

    2. Relevant equations

    3. The attempt at a solution
    From the free body diagram,

    I think this is correct, however the solution states the correct answer as
    a=m*g/(m+2M), indicating a problem with the signs.

    Attached Files:

  2. jcsd
  3. Jun 26, 2010 #2


    User Avatar
    Homework Helper

    While finding the acceleration of the masses, you have to take into account the tension in the string.

    (M +m)g - T = (M+m)a......(1)

    T - mg = ma. ..........(2)

    Now solve for a.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook