PHYS111 Lecture : Physcis Summary #1.docx
11 Mar 2014
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Scalar: refers to a quantity or magnitude: ex. Vector: refers to a quantity with a magnitude and direction: ex. Note: the equivalence of the magnitude and direction of vectors does not depend on their position. Coordinate systems: are used in displaying vectors: cartesian (expressed graphically with x,y,z, polar (r, , geographic (using ex. longitude, latitude, compass (n, s, e, w directions) If an angle and a side are given for a right angled triangle use trig ratios ex. Unit vectors have a magnitude of one & they can be used to define the x and y vectors in the x and y direction. The magnitude is changed but the direction remains constant and if a ve scalar is used then the direction is reversed. 54m/s north x 50m/s north = 2700 m/s north. There are two ways to represent: graphically (must add vectors tip to tail) To get cvector add both avector and bvector together.
