Physics · Mechanics and Properties of Matter · Chapter 2

Physical Quantities and Measurement

Taught in Class 9Class 11O LevelA Level

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Topics in this chapter

2.1Base and Derived QuantitiesPhysical quantities, the seven SI base quantities and their units, and derived quantities such as speed, force, pressure and energy with their units.Interactive lesson
2.2SI Units and PrefixesThe International System of Units (SI), prefixes from pico to tera, converting units, and the rules for writing units correctly.Interactive lesson
2.3Scientific NotationWriting very large and very small numbers in scientific notation (standard form), and multiplying and dividing with powers of ten.Interactive lesson
2.4Metre Rule and Measuring TapeLeast count, using a metre rule and measuring tape correctly, worn ends and how to avoid parallax error.Interactive lesson
2.5Vernier CallipersParts of vernier callipers, least count 0.01 cm, taking a reading, and positive and negative zero error with corrected readings.Interactive lesson
2.6Screw GaugeParts of a micrometer screw gauge, pitch and least count 0.01 mm, taking a reading, the ratchet and zero error.Interactive lesson
2.7Measuring Mass and TimeMeasuring mass with physical and electronic balances, measuring time with stopwatches, atomic clocks and reducing reaction-time error.Interactive lesson
2.8Significant FiguresRules for counting significant figures, rounding off, and significant figures in calculations.Interactive lesson
2.9Errors and UncertaintiesSystematic and random errors, uncertainty, accuracy and precision, and percentage uncertainty for Class 11 and A Level.Interactive lesson
2.10Dimensional AnalysisDimensions of physical quantities, checking equations with the principle of homogeneity, deriving formulas and the limits of the method.Class 11A LevelInteractive lesson

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