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chap12sec2

# chap12sec2 - 12.2 Vectors ,speed,. ; vector. byvectorsinclu

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12.2 Vectors Scalars are quantities that only have a magnitude like mass, speed, and electric field strength. Many times it is often useful to have a   quantity that has not only a magnitude but also a direction; such a quantity is called a  vector . Examples of quantities represented  by vectors include velocity, acceleration, and virtually any type of force (frictional, gravitational, electric, magnetic, etc.). Note that   all of these quantities not only have a magnitude (such as speed – the magnitude of the velocity vector) but also occur or act in a given  direction. It is convenient to represent both quantities by just one symbol, the vector. Graphically, a vector is represented by an arrow, defining  the direction, and the length of the arrow defining the vector's magnitude.  two-dimensional   vector  is an ordered pair  1 2 , a a = a   of real numbers.

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chap12sec2 - 12.2 Vectors ,speed,. ; vector. byvectorsinclu

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