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Help me in understanding and solving

  1. May 19, 2009 #1

    A child pulls a train of 2 cars with a horizontal force F of 10N .
    Car1 has a mass of m1=3kg, and car2 has a mass of 1kg
    The mass of the string connecting the the cars is small enough to be set equal to zero, and the friction can be neglected .


    a- Find the normal force exerted on each car by the floor.
    b- What is the tension force in the string
    c- Find the acceleration of the train




    thanx



    well plz help me to solve and understand this problem
    I can't figure out why the normal force in this problem is equal to the weight or how to find the acceleration.!! b]
     
  2. jcsd
  3. May 19, 2009 #2
    This is the way i did it

    a- Car 1
    N-F= ma
    N - mg = ma
    N= mg+ma
    N= 3*9.8 + 3*9.8 = 29.4 + 29.4 =58.8

    Car 2
    The same way so its N =19.6

    b- F-T = m a
    F= mg= 3+1 * 9.8 = 39.2
    so
    39.2 - T = 1+3 * a
    -T = -39.2 +4*a
    a=?
    I COULDN'T FIGURE OUT HOW TO FIND THE ACCELERATION.!

    PLZ PLZ PLZ HELP ME UNDERSTANT THIS PROBLEM
    I'VE AN EXAM IN 2 DAYS ANT I CAN'T UNDERSTAND A WORD OF THIS SUBJECT
     
  4. May 20, 2009 #3
    goto this page
    100% correct
    http://knowhowstuff.blogspot.com/2009/05/physics-forum-answers.html" [Broken]
     
    Last edited by a moderator: May 4, 2017
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