Can you use speed and velocity interchangeably?

  • Thread starter ellieee
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  • #1
ellieee
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Homework Statement:
qn (di)-> the graph is a v-t graph, so shouldn't we say "constant velocity" instead of "speed"?
Relevant Equations:
nil
16255635504933063555622718551114.jpg

16255635202437013700399969144045.jpg
 

Answers and Replies

  • #2
Doc Al
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Yes. It's better to describe it as constant velocity, as speed just describes the magnitude and not the sign. (I presume this is one-dimensional motion.)
 
  • #3
Delta2
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In motion in a straight line such as in your example, the concepts of velocity and speed are almost identical: If speed is x, then velocity will be x or -x. I repeat, this holds only in motion in a straight line, it does not hold for other motions e.g. circular motion.
 
  • #4
ellieee
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in a straight line
how can you tell it's in a straight line ?
 
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  • #5
Delta2
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how can u tell it's in a straight line ?
I can not infer it from the given data (the screenshot of the graph isn't complete, doesn't completely show the text that describes the graph), somehow I thought it was given to you.
 
  • #6
Doc Al
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how can u tell it's in a straight line ?
Since they label it a velocity-time graph, where the velocity is constant it must be moving in a straight line. (Assuming it's labeled accurately.)
 

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