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Unformatted text preview: 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...
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 Spring '08
 TSChang
 Physics, Cartesian Coordinate System, 20 m/s, vy, 35°

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