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Chapter 3 Physics Notes

# Chapter 3 Physics Notes - Chapter Three Notes Physics 195...

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1/5/11 Chapter Three Notes Physics 195

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1/5/11 VECTORS -In 1dimension, we could specify distance with a real number, including + or - sign. e.g., a = -g -In 2or 3dimensions, we need more than one number to specify the distance: -To illustrate this, consider the position vector r in 2 dimensions. Example : Where is UCSD? -Choose origin at SDSUSDSU -Choose coordinates of distance (miles), and normal directions (N-S,E-W) -In this case r is a vector that points about 15 miles north-west.
1/5/11 VECTORS There are two common ways of indicating that something is a vector quantity: -Boldface notation: A -Arrow notation: Unit Vector is a vector having length 1 and no units specify a direction

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1/5/11 VECTORS The components of r are its (x,y,z)coordinates r = (r ,r ,r )= (x,y,z) Consider this in 2-D (since it’s easier to draw): = x = r cos θ = y = r sinθ where r = | r|
1/5/11 -Used to describe the position of a point in space. -Coordinate system consists of. 1A fixed reference point called the origin.

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