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True or False What a graph of velocity vs time tells us about force

  1. Feb 20, 2013 #1
    1. The problem statement, all variables and given/known data


    http://postimage.org/image/qj7owwxcb/

    The graph below shows the velocity of an object of mass 1 g. Each line on the time axis represents 3 s and each line on the velocity axis represents 2 m/s. Which of the following statements, describing the graph above are true?



    A) In section D, the displacement is negative.
    B) In section D, the force changes but the sign remains constant.
    C) In section C, the force is positive.
    D) In section C, the force is constant and non-zero.
    E) In section A, the force acts in the direction of the velocity

    2. Relevant equations

    Newton's Second Law

    3. The attempt at a solution

    A False, still in the positive direction since velocity was just decreased but not negative
    B False, the force changes sign
    C True, velocity is increasing, acceleration is greater than 0 so F = ma is greater than 0
    D True, same reason as C
    E True, since acceleration is changing
     
    Last edited: Feb 20, 2013
  2. jcsd
  3. Feb 20, 2013 #2
    Re: True or False What a graph of velocity vs time tells us about forc

    What graph?
     
  4. Feb 20, 2013 #3
    Re: True or False What a graph of velocity vs time tells us about forc

    I fixed the URL
     
  5. Feb 20, 2013 #4
    Re: True or False What a graph of velocity vs time tells us about forc

    Your answers seem correct to me.
     
  6. Feb 20, 2013 #5
    Re: True or False What a graph of velocity vs time tells us about forc

    Thanks for checking me astarael!
     
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