PHYS
Physics Premidterm Examination Notes

# Physics Premidterm Examination Notes - Chapter1:Units,...

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Chapter 1: Units, Physical Quantities and Vectors Physics A branch of science which studies  matter and energy. Standards and Units Measurement   Comparison Unit Consistency and Conversion An equation must be dimensionally  consistent Always carry units through  calculations Convert to standard units as  necessary Fundamental Quantities Mass   kg Time   sec Length   meters Prefixes Deci Kilo Centi Mega Milli Deka Micro Giga Nano Tera                           Uncertainty and Significant Figures 1. Multiplication and Division      - Significant Figures 2. Addition and Subtraction      - Least Accurate Measure of two quantities Ratio Circumference and Diameter 3.14 3 significant Figures Scalar Quantities  – physical quantities  described by magnitude only. Vector Quantities  – physical quantities  characterized by both magnitude and  direction. For a magnitude to be equal it should be: Same in length Same in direction A magnitude is: A force A displacement A velocity An acceleration Vectors are: Operable Can be added and multiplied 1 } } small big

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Graphical Method 1. Tail-to-Head (Head-to-Tail) 2. Pure Horizontal Types of vectors 1. Parallel 2. Equal 3. Anti-parallel 4. Perpendicular Commutative Property Both answers are equal A + B = C B + A = C Component Vectors Vector Equation A + B = C Note:
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