vectors

# vectors - Vectors Caution: LEARN HOW TO ADD VECTORS, IT...

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Vectors Caution : LEARN HOW TO ADD VECTORS, IT WILL BE EXTREMELY IMPORTANT IN SUBSEQUENT PHYSICS MATERIAL. Definitions Scalar a quantity described by just a number (e.g. temperature, mass, etc.) Vector a quantity described by two numbers, known as the magnitude and direction. (e.g. velocity, force, electric field, etc.) Scalars obey ordinary arithmetic, but for vectors we must invent a new arithmetic. Vector Arithmetic A vector may be represented by an arrow that gives direction and magnitude. Vector addition is defined by the head-to-tail or parallelogram law. This is also called the geometric method of vector addition. I will explain this in class. To add vectors graphically accurately requires a ruler and a protractor.

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Another way of representing a vector is to give the length of each of its components but first we must define vector components. Consider a vector r (an arrow) that makes an angle of 60 degrees with the positive x-axis and has a length of 4. The x-component of
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## This note was uploaded on 07/29/2011 for the course PHY 2048 taught by Professor Chen during the Spring '08 term at UNF.

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vectors - Vectors Caution: LEARN HOW TO ADD VECTORS, IT...

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