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  1. Nov 22, 2014 #1
    1. The problem statement, all variables and given/known data
    A vertical pully has two weights attached. One of the weights is 4kg while the other weight is unknown. The 4kg weight is heavier and accelerates 2m/s2

    2. Relevant equations

    3. The attempt at a solution
    i have no idea....
  2. jcsd
  3. Nov 23, 2014 #2
    What kind of pulley system are we dealing with here? Is it an Atwood's machine, ie, both masses are just hanging from a pulley? Or are we dealing with a pulley system where one mass rests on a table and another hangs from a pulley?
  4. Nov 23, 2014 #3
    First draw free-body-diagrams for both masses. To use the Newton's 2nd law you will need to know the net force acting on each mass.
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