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Homework Help: Force problem

  1. May 2, 2010 #1
    1. The problem statement, all variables and given/known data
    Find the acceleration of the object in the figure with mass 4 kg when it's applied a force of a)50N b)100N and which makes an angle of 37degrees.(sin 37=0.6,cos 37=0.8)
    [PLAIN]http://img97.imageshack.us/img97/5863/forceg.png [Broken]

    2. Relevant equations
    F=ma


    3. The attempt at a solution
    I have tried to take first Fx=ma for 50N which goes in the direction of x-axis I got 10m/s^2 which is correct but when i try with 100N with Fy=ma I don't get the correct answer.Or with Fx=ma
    could you please help me?
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. May 2, 2010 #2
    When the 100N force is applied, note that there is a net upwards force on the block and hence the block has an upward acceleration. Factor that in and you should get the correct answer.
     
  4. May 2, 2010 #3
    When it applied 100N it should be 20.6m/s^2 upwards direction.
     
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