1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Vector Projection

  1. Oct 15, 2009 #1
    1. The problem statement, all variables and given/known data

    I have a vector diagram attached below. Vector A is perpendicular to vector B.

    How do you figure out what angle to use in order to project vector A onto the x and y axis?

    2. Relevant equations

    A dot B = ABcos(angle)

    3. The attempt at a solution

    180-30-90 = 60?

    Attached Files:

  2. jcsd
  3. Oct 16, 2009 #2


    User Avatar
    Science Advisor

    Exactly right- though you don't really need the "180" and "90". Extend A back to line C and you will see that the three lines form a right triangle. That tells you that the angle A makes with C is the complement of 30 degeres, 60. And, since C is parallel with the x-axis, extending it further shows (corresponding angles in parallel lines) that it makes the same angle with the x-axis.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Vector Projection
  1. Vector projections (Replies: 10)