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F Vector is parallel to r vector formula ?

  1. Feb 23, 2014 #1
    Hi everyone

    ( the force vector parallel to the position vector r ) = Force vector* (r vector / r)

    I don't know how did they find this relation ?
    it seems to me they multiplied F hat by the unit vector ?
    why ??
    I am just confused about it

    any idea ??
    Last edited: Feb 23, 2014
  2. jcsd
  3. Feb 23, 2014 #2
    F parallel hat= (F hat) * (r hat / r)
  4. Feb 23, 2014 #3

    the projection of v into the direction of u

    0k that's why :)

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