Unit 1 — Measurement & Units
Goal: become fluent with significant figures, scientific notation, and unit conversions, then apply them to speed and energy.
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Read this unit like a small book—each lesson is short and focused. Green check = finished on this device.
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Lessons
1. Scientific Notation — Basics
Write any number as \( a \times 10^n \), with \(1 \le a < 10\). Move the decimal and read the exponent.
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2. Significant Figures
Counting rules; rounding; why sig figs matter in physics measurements.
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3. Units
Units of physics quantities.
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4. Unit Conversions with Factors
Use unit ratios to convert km/h → m/s and N·m → J with clean cancellations.
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5. Speed as a Rate
Interpret speed as distance per time; compare speeds in different units.
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