Multiplying Vectors - Dot and Cross Products -

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Presentation transcript:

Multiplying Vectors - Dot and Cross Products - 13.3

Dot Products… One of two ways to multiply vectors Yields a number – not another vector Basic Defintion:

a b q What is it good for? Angles between vectors Direction cosines 13.3: 21, 23, 25 Direction cosines 13.3: 29 VPython demo Projection vectors 13.3: 35, 47 a q b

Cross Products… A way to multiply two vectors and return a new vector Basic Definition: How do you remember this!!! a X b b VPython demo a

What’s it good for? Cool way to create normal (perpendicular) vectors Used in many basic definitions in physics: Examples: 13.4: 4, 13,33