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Atwood's Machine and incline plane combined.

  1. Mar 1, 2007 #1
    So here is the problem with the two parts and then the teacher's clue... I would be majorly appreciative if you could help me out.

    Two packing crates of masses m1 = 10.0 kg and m2 = 4.00 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.26. The 4.00 kg crate lies on a smooth incline of angle 40.0°. Find the acceleration of the 4.00 kg crate.

    Part B is:
    Find the tension in the string.

    The clue that the teacher gave us is:
    #4 (Pulley and incline) A combination of the Atwood’s machine and an incline plane.
    Construct the equation for each object and solve for ’a’ and ’T’. Both objects
    share the same ’a’ and ’T’.

    Thanks for your help.:cry:
  2. jcsd
  3. Mar 2, 2007 #2


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    Staff Emeritus
    Science Advisor

    Well, have you followed your teacher's hint? This is homework and, as such, we require that you show your work before we can help you.
  4. Mar 2, 2007 #3
    The forces involves are T1, T2 and the components of mg. T1 is tension of the rope connecting the m1 and the 4kg crate, and T2 is the tension of the rope between m1 and m2.

    Draw the free body diagram of m1, m2 and the 4kg crate. Make three equation and solve for a , T1 and T2.
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