Phys 3, Section 2 				August 30, 1996 

VELOCITY

Displacement Vector

Vector quantities have both direction and magnitude

Vector Algebra

Addition

• Parallelogram (graphical method)
• Tail-to-Head (graphical method)
• Components (algebraic method)

Subtraction

• Add reversed vector subtrahend

Multiplication

• Scalar multiplication
• Vector Multiplication (cross product [returns vector] and dot product [returns scalar])
  
  

Average Velocity

Instantaneous Velocity

Question: Is speed just the magnitude of velocity?