Vectors, dot product, and vector components (10/7/2008)

1. Main Points
Today I learned more about vectors which is a geometric object that has both a magnitude and a direction. A vector is frequently represented by a line segment with a definite direction, or graphically as an arrow, connecting an initial point A with a terminal point B. Vectors can be calculated by multiplication and addition for example.

2. Challenging
The concept of a unit vector and its rationalization was a little hard to understand, maybe you could go over this in class?

3. Intriguing
Vectors is a interesting topic I think because they play an important role in physics: velocity and acceleration of a moving object and forces acting on a body are all described by vectors. Many other physical quantities can be usefully thought of as vectors.