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Unformatted text preview: Chapter 1 & 2 Notes ERes PasswordP31nji9 Physics o Fundamental Science Concerned with basic principles of the universe Foundation for other sciences o Five major areas Mechanicsmotion Electromagnetism Electricity, magnetism and their work done together Waves and optics Thermodynamics Modern physics Quantum mechanics and relativity Mechanics o Motion in 1 dimension o Vectors and motion in 2 & 3 dimensions o Law of Motion and application o Work and energy o Momentum and collisions o Rotational motion and torque o Static equilibrium and elasticity Physics and Measurement o Physics attempts to find a small number of fundamental laws and theories, using mathematics, which governs natural phenomena o Physics is a science not applied mathematics. Use experiments to validate/ modify physical laws Need consistent measurement quantities to compare theory and data, different experiments o The basic physical quantities of mechanics, the study of motion: Length Mass Time Units of Measurement o Standardized unitsSISystme International Lengthmeter (m) 1 meter = the distance traveled by light in vacuum in 1/299,792,458 second o Spend of light in a vacuum= 299,792,458 m/s Masskilogram (kg) 1 kilogram = mass of a platinumiridium alloy cylinder in 3.9 cm in. diameter and 3.9 cm in height o Reference mass in Paris, Maryland Mass is not weight! Timesecond (s) 1 second = time of cesium133 atom to undergo 9,192,631,770 vibrations Powers of 10 o Prefixes indicate the power of 10 in measurements o Each prefixes has specific name, abbreviation o Prefixes can be used with any base unit Multiplies the base unit o Examples 1 mm = 103 m 1 mg = 103 g Power Prefix Abbreviation 1024 Yocto y 1021 Zepto Z 1018 Atto A 1015 Femto F 1012 Pico P 109 Nano N 106 Micro 103 Milli M 102 Centi C 101 Deci D 10 3 Kilo K 10 6 Mega M 10 9 Giga G 10 12 Tera T 10 15 Peta P 10 18 Exa E 10 21 Zetta Z 10 24 Yotta Y Dimensions & Derived Quantities o Dimension note the physical nature of quantitylength, mass, time, ect. o Denoted by brackets Length [L] Mass [M] Time [T] o Dimensional analysischeck correctness of answers, help derive equations Treat dimensions as algebraic quantities Both sides of an equation must have same dimensions Area = [L 2 ] Volume = [L 3 ] Speed= [L/T] Acceleration = [L/T 2 ] o Derived quantitiesbuilt from basic quantities Density: = p mV Units [M]/[L 3 ] kg/m 3 Estimates and Order of Magnitude o Order of MagnitudeWhat power of 10 is the number closest to?...
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 Winter '08
 DISHAW
 Physics, Magnetism, Work

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