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Homework Help: Acceleration vs Time Graph

  1. Nov 13, 2007 #1
    If a object was heading towards the orgin while slowing down. How would the a vs t graph look. I keep thinking it would be a positive acceleration line, but Im not sure wondering if anyone could clarify
     
  2. jcsd
  3. Nov 13, 2007 #2
    If it is slowing down, what does that say about the acceleration?

    An a-t graph plots acceleration. It doesn't matter if the object is moving towards the origin or away from it.
     
  4. Nov 13, 2007 #3
    Thats not true. Because if they gave you a x vs t graph of a object heading towards the orgin and speeding up the acceleration would still be negative because of the slope
     
  5. Nov 13, 2007 #4
    What exactly do you mean by this?

    If something is speeding up, the slope of the v- t graph is positive. Hence the acceleration is positive.
     
  6. Nov 13, 2007 #5
    Think of it as ball rolling down a ramp. it starts at 50m-----------ends at 0m
     
  7. Nov 13, 2007 #6
    Hmmm.... maybe you mean speeding up in a negative direction?
    In that case your statement is correct.
     
  8. Nov 13, 2007 #7
    so back to the question if its speed was negative and starts to slow down what would the a vs t be?
     
  9. Nov 13, 2007 #8
    Maybe you're mixing up your horizontal and vertical components....
     
  10. Nov 13, 2007 #9
    if the velocity is in a negative direction and it is slowing down then the acceleration is in the positive direction.
     
  11. Nov 13, 2007 #10
    o ok thankyou
     
    Last edited: Nov 13, 2007
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