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: 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: Present your final answers with 3 sigfigs. •Vectors: magnitude and direction. Vector addition obeys parallelogram law. Rectangular components of a vector in a 2-D Cartesian coordinate system ˆˆxyxyV ViVj=+=+GGGVVV VxVyxy θ22cos , sin, tanxyyxVVVθ===+=Example
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