Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Vector definition, need help

  1. Nov 18, 2012 #1
    Hi For some strange reason I just can't see why this is true?? Can anyone help me explain why the left side can be written as the right side? I added a picture.

    Attached Files:

  2. jcsd
  3. Nov 18, 2012 #2
    The thing that confuses me the most is the p-tu.
  4. Nov 18, 2012 #3


    User Avatar
    Science Advisor

    It's just the associative law for addition of vectors:
    (v- p)+ (p- tu)= v+ (-p+ p)- tu= v- tu.
  5. Nov 18, 2012 #4
    Ahh that's the trick huh? So is (v- p)+ (p- tu) a geometric figure? Or just something to be considered as numbers.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook