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Velocity vector's change of direction

  1. Oct 26, 2005 #1
    hi

    If an object changes it's direction but not speed, then velocity vector will only change its direction but not magnitude.

    * ... delta

    *r... displacement vector

    Formula for velocity change is *v = *r / *time

    This formula doesn't tell us anything about the direction of *v, it tells us
    only about its magnitude ?

    Same could be said for acceleration vector a. Formula will only tell you acceleration vector's magnitude, but not it's direction ( well we do know the direction is same as *v, but since we don't know the direction of *v it's of little use ) ?

    bye
     
  2. jcsd
  3. Oct 26, 2005 #2

    Tide

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    The correct "formulas" are

    [tex]\vec v = \frac {d \vec r}{dt}[/tex]

    [tex]\vec a = \frac {d \vec v}{dt}[/tex]

    These are vector quantities. If the direction of the velocity changes without changing the speed, the velocity and acceleration are perpendicular to each other.
     
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