Intro&vector_components - Introduction Physics...

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Introduction Physics provides quantitative explanations to the basic phenomena in our universe based on experimental observations and mathematical analyses . Physics approach: observations building an idealized model with assumptions and simplifications establishing theories in mathematical equations validating theories by experiments Units and Standards: An equation must be dimensionally consistent, and watch for unit consistency in numerical computations. We work with SI system in this course. In mechanics, there are four fundamental units: Time – sec, Length – m, Mass – Kg, and Temperature – K . Significant figures: Keep all digits on your calculator in the intermediate computations, and present your final answers with 3 sigfigs . Vectors: Brief review Definition of vector: A vector quantity has a magnitude and a direction. The length of the line segment represents the magnitude of the vector and in 2D its direction is defined by an angle measured from some reference. Vector addition obeys parallelogram law.
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