1. UNITS AND MEASUREMENT
Measurement is crucial in physics, relying on universally accepted standards known as units. Fundamental quantities are represented by base units, while all other quantities are derived from these bases, creating a comprehensive system of measurement. The International System of Units (SI) standardizes these units for global consistency, emphasizing the importance of significant figures and dimensional analysis in accurately reporting measurements.
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What we have learnt
- Measurement is the comparison of physical quantities to standard units.
- The International System of Units (SI) ensures standardization and simplicity in scientific, technical, and industrial measurements.
- Dimensional consistency is vital in equations, allowing us to check their correctness and deduce relationships between physical quantities.
Key Concepts
- -- Fundamental Units
- Basic units that define fundamental physical quantities such as length, mass, and time.
- -- Derived Units
- Units that can be expressed as combinations of fundamental units, such as velocity and acceleration.
- -- Significant Figures
- Digits in a number that are necessary to express the precision of a measured value.
- -- Dimensional Analysis
- A technique for checking the consistency of equations and deducing relationships among physical quantities.
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