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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: 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 2D Cartesian coordinate system
ˆˆ
x
yx
y
V V
iV
j
=+=
+
GGG
VV
V
V
x
V
y
x
y
θ
22
cos ,
sin
,
tan
xy
y
x
V
V
V
θ
==
=+
=
Example
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This note was uploaded on 04/06/2008 for the course PHYS 2305 taught by Professor Tschang during the Fall '08 term at Virginia Tech.
 Fall '08
 TSChang
 Physics

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