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Motion in 1 dimension

  1. Mar 10, 2016 #1
    1. The problem statement, all variables and given/known data
    Identify the motion that the different sections of the graph describe

    2. Relevant equations


    3. The attempt at a solution
    t=0-2 is accelerating
    t=2-4 is stationary
    t=4-5 accelerating
    t=5-9 decelerating/slowing down

    Options which are given: Constant speed, moving back to the start position and the above. Is my solution correct?
    thank in advance
     

    Attached Files:

  2. jcsd
  3. Mar 10, 2016 #2

    Doc Al

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    Staff: Mentor

    First things first: On such a diagram, what would a constant speed motion look like? What aspect of the diagram tells you the speed? Then: What would acceleration look like?
     
  4. Mar 10, 2016 #3
    well since the distance is changing over time, that must imply that the object is moving hence for t= 0-2 it is accelerating. Now for t=2-4 distance is not changing therefore it must be stationary. for t=4-5 and t=5-9 the object is accelerating but the first interval (t=4-5) is accelerating faster than the other (t=5-9) . My confusion is that they had provided other possible answers which i have stated, but i can not see any constant acceleration in that diagram
     
  5. Mar 10, 2016 #4

    Doc Al

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    Staff: Mentor

    Yes, during that time the object is moving. But moving does not mean accelerating. What's the definition of acceleration?
     
  6. Mar 10, 2016 #5
    the rate of change of velocity over time, does that mean the object is moving in constant speed?
     
  7. Mar 10, 2016 #6

    Doc Al

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    Staff: Mentor

    Exactly!

    So what would a graph of constant velocity look like?
     
  8. Mar 10, 2016 #7
    Graph that shows distance and time, so distance/time= constant speed. so the different intervals were the distance is changing, is the objects always at constant speed?
     
  9. Mar 11, 2016 #8

    Doc Al

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    Staff: Mentor

    Tell me what such a displacement vs time graph looks like. Would it be straight lines, curved lines, flat lines, what?

    How would you draw a graph of the motion of an object moving at constant speed?
     
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