Units and Measurement

Physics · Chapter 1 · Units 1-3: Physical World and Measurement; Kinematics; Laws of Motion

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Physics as a science of measurement; unit as a reference standard; systems of units (CGS, FPS, MKS, MKSA, SI)
The seven SI base units, supplementary and derived units; rules for writing unit names and symbols; prefixes from atto to tera
Other common units: fermi, angstrom, light year, astronomical unit, parsec, unified atomic mass unit (u); measuring length, mass and time
Errors in measurement; significant figures; rules for counting and for arithmetic operations; rounding off; order of magnitude
Dimensions and dimensional formulae of physical quantities and constants; principle of homogeneity
Uses of dimensional analysis: checking equations, finding dimensions of constants, converting units; limitations