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PLEASE HELP Projectile Motion: Two-dimensional Kinematics

  1. Sep 18, 2008 #1
    PLEASE HELP!! Projectile Motion: Two-dimensional Kinematics

    The horizontal and vertical components of velocity...
    A) have no relationship to each other.
    B) are related to the overall velocity, but can be treated separately.
    C) are related to the overall velocity.

    I know it's either A or B but the wording is confusing me!!! PLEASE HELP!!! It is an online quiz
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 18, 2008 #2
    Re: PLEASE HELP!! Projectile Motion: Two-dimensional Kinematics

    Given the horizontal and vertical components of velocity, is there a way to calculate the magnitude of the overall velocity? Draw a velocity triangle.

    If there is, then the answer must be b.
     
  4. Sep 18, 2008 #3
    Re: PLEASE HELP!! Projectile Motion: Two-dimensional Kinematics

    Thanks for replying so fast!!!!
    There are no values given, it is just a theoretical question...I know that to calculate each component you need to have the value of the overall velocity - is that right? So, does that mean they are "related" to the overall velocity? I'm just not sure what he means...
     
  5. Sep 18, 2008 #4
    Re: PLEASE HELP!! Projectile Motion: Two-dimensional Kinematics

    "I know that to calculate each component you need to have the value of the overall velocity - is that right?"

    Yes.

    "So, does that mean they are "related" to the overall velocity?"

    Yes.
     
  6. Sep 19, 2008 #5
    Re: PLEASE HELP!! Projectile Motion: Two-dimensional Kinematics

    Consider an x-y plane. If you move a particle directly to the right, it doesn't influence that particle's motion upward or downward (y) at all. Similarly, if you move the particle directly upward, it doesn't influence it in the left or right directions (x). But either of these will influence the overall velocity, which is made up of both x and y velocity components.

    v = [tex]\sqrt{v_{x}^{2} + v_{y}^{2}}[/tex]
     

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