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Spring, force and two blocks

  1. Mar 26, 2012 #1
    1. The problem statement, all variables and given/known data

    a 30 kg is restin on a flat horizontal table. on top of this block rests a 15 kg block, to which a horizontal spring is attached, as shown in the drawing. the spring constant is 325N/m. the coefficient of kinetic friction between the lower block and the table is 0.600, and the coefficient of static friction between the two block is 0.900. a force F is applied to the lower block. this force is increasing in such a way as to keep the the blocks moving in a constant speed

    2. Relevant equations
    F=kx
    Fk=usmg
    Fs=usmg


    3. The attempt at a solution
    im clueless dont know where to start. plz help guys
     
  2. jcsd
  3. Mar 26, 2012 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi Leata! Welcome to PF! :wink:

    Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:

    (oh, and what is the spring attached to?? :confused:)
     
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