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Tension/ Force problem; How should I look at this?

  1. Sep 29, 2008 #1
    1. Three identical blocks connected by ideal strings are being pulled along a horizontal frictionless surface by a horizontal force F. The magnitude of the tension in the string between blocks B and C is T= 3.00N. Assume that each block has mass m= 0.400kg .

    [a]--------[c]---->F

    What is the magnitude F of the force?

    What is the tension between block a and b?

    2. F=ma;



    3. The magnitude of the force should equal m*a, so (.4*3)*(3/.8) should provide the magnitude. And from that (.4)*(3/.8) should give me the answer to the second question. I feel that I am making some unwarranted assumptions. Please help
     
  2. jcsd
  3. Sep 29, 2008 #2
    T=2*m*a => 3.00=2m*a => a is known

    F=3*m*a =>....
     
  4. Sep 29, 2008 #3
    Ok so a= 3.75 m/s^2; From this: F= 1.2*3.75; F=4.5N; T=.8*3.75; T=3N ?
     
  5. Sep 29, 2008 #4
    No, btween a and b m=.4; so T= 1.5N

    Thanks, I understand now!! :-)
     
  6. Sep 29, 2008 #5
    OK! Good luck!
     
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