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Applies of F=ma

  1. Jul 6, 2013 #1
    This is my problem,
    ABCD is a lift.

    1-- when the lift not moving i want the T and T1.
    T1= 3mg
    T= 2mg
    Right ?

    2-- when the lift is moving with accelartion a. I want to know the new T and T1.
    Are they
    T1 = 3m(g+a)
    T = 2m(g+a)

    Am i doing it right?
  2. jcsd
  3. Jul 7, 2013 #2

    Simon Bridge

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    Science Advisor
    Homework Helper

    Please show your reasoning.
    Are the masses not equal then? I don't see that on your diagram.
    You should draw separate free body diagrams for each mass.
  4. Jul 7, 2013 #3
    First mass is m
    Second one is 2m
  5. Jul 7, 2013 #4


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    Staff: Mentor

    That looks right. Just make sure you assign the correct +/- sign to 'a'.
  6. Jul 7, 2013 #5
    Yeah, thank you sir
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