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Is the ball's speed increasing?

  1. Feb 19, 2015 #1
    1. The problem statement, all variables and given/known data

    The figure below shows a moving ball, its momentum, and the net force acting on it an instant in time.

    At this instant, the ball's speed is:

    1) not changing

    2) decreasing
    3) increasing

    2. Relevant equations

    None.

    3. The attempt at a solution

    My guess would be that the balls speed is increasing since the force and change of momentum both go towards + x direction but I'm not totally sure, any help?
     

    Attached Files:

  2. jcsd
  3. Feb 20, 2015 #2

    Orodruin

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    Correct, but you could formalise your answer a bit. It is possible that the momentum and force both have positive components in the x direction and have decreasing speed. The real issue is about the angle between the force and momentum vectors.
     
  4. Feb 20, 2015 #3
    That makes sense, if the force was pointed straight down instead, would the ball's speed then be slowing down?
     
    Last edited: Feb 20, 2015
  5. Feb 20, 2015 #4

    Orodruin

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    Given the same momentum, yes.
     
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