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Basic Q's Net Force and Acceleration

  1. Jun 5, 2014 #1
    1. The problem statement, all variables and given/known data
    akvdoo.jpg



    2. Relevant equations
    I am wondering if the answers given in the teacher's guide are incorrect.
    Ans given for #2: [All same], [A,C,B,D]
    Ans given for #3: [A,C,D,B]

    3. The attempt at a solution
    My answers:
    #2a: Net forces: A,B,C are 5N; D is 10N. Therefore the order of the net forces from greatest to least is D, followed by A,B,C which are equal.
    #2b: Their accelerations are a) 5N/5kg=1m/s2 b) 5N/10kg=0.5m/s2 c) 5N/5kg=1m/s2 d) 10N/20kg=0.5m/s2. Therefore the order of their accelerations from greatest to least would be A&C, which are the same, followed by B&D which are the same. Admittedly, the teacher's guide could be saying the same thing for this second part of the answer, but I can't be certain since their answer says nothing about A=C and B=D.
    #3: Accelerations are:
    a) a=(1000N-800N)/(1000N/9.8)=1.96m/s2
    b) a=1.23 m/s2
    c) a=1.4 m/s2
    d) a= 0.98 m/s2
    Therefore the order from greatest to least is A,C,B,D
     
    Last edited: Jun 5, 2014
  2. jcsd
  3. Jun 5, 2014 #2

    NascentOxygen

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    Staff: Mentor

    Hi kstbts. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif [Broken]

    I like your answers, they are the same as mine.
     
    Last edited by a moderator: May 6, 2017
  4. Jun 5, 2014 #3
    Thanks NascentOxygen.
     
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