PHYS 141 Lecture Notes - Lecture 1: Mnemonics In Trigonometry, Parallelogram, Pythagorean Theorem
Document Summary
Just a number: example: age, mass, length, volume, temperature, density, energy, power, time. Vector: has magnitude and direction: arrow in direction of physical direction, size proportionally to magnitude, symbol: arrow above vector letter. Vector addition: same direction: vector + vector, opposing directions: vector vector. Components: you can determine unknown components of a vector by using trigonometry functions (soh-cah-toa, ax = acos , ay = asin . Magnitude: you can find magnitude by using pythagorean theorem in right triangles when you know components. Parallelogram rule: when vectors are touching tail to tail, find new vector between them by drawing a parallelogram from existing vectors. New vector will be the cross point between them. Direction will be away from tail to tail vector connection. Triangle rule: when vectors are touching head to tail, find the new vector by drawing a straight line from tail of the one vector to the head of the other.
