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RE:Newton's Laws of Motion Block Problem

  1. Jan 11, 2014 #1
    1. The problem statement, all variables and given/known data
    In the arrangement shown, all surfaces are frictionless, mass of block M = 30 kg and m = 20 kg.
    If F = 180 N , Find accelerations of both the blocks

    attachment.php?attachmentid=65514&stc=1&d=1389452404.jpg


    2. Doubt

    How much force will be applied on the larger block M by the pulley(coz of tension)?
    1. T towards right
    2. T towards up
    3. T√2 45° to the right
    4. Any other answer


    3.Reason for doubt

    If the total for exerted on the T i(cap) + T j(cap) i.e. Fnet on Bock M due to tension of string on pulley is T√2,
    then there will be a force which will tend to pull block M upward......and if the accln of string is much higher, then the tension in the string will cause the block to accelerate up.

    [To Jilang and tiny-tim,
    After reading ur answer, i had this doubt too...so i asked again]

    If anything else, please answer.....
    Thanks
     

    Attached Files:

  2. jcsd
  3. Jan 11, 2014 #2

    tiny-tim

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