Vector addition

• Adding?vectors together lets us describes the?movement between two points
• The?single?vector this creates is called the?resultant?vector
• Subtracting?a vector is the same as?adding the negative?vector
• Adding the vectors?PQ?and?QP?gives the zero vector, denoted by a bold zero?0

• You can add and subtract vectors in any of the forms previously described:

Scalars and parallel vectors

• Multiplying by a positive?scalar?only changes the?size?of a vector, not its?direction
• Two vectors are?parallel?if and only if one is a?scalar?multiple?of the other