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Understanding Physics: The Essence of Measurement and Dimensional Analysis

Delve into the realm of physics, exploring the significance of measurement, standard units, and the fascinating world of dimensional analysis. Learn how to convert between units with ease and precision using conversion factors and unit-labeled numbers. Enhance your understanding of the relationships between matter and energy through the lens of precision measurement and analysis.

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Understanding Physics: The Essence of Measurement and Dimensional Analysis

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  1. Physics The science that deals with the relationship between matter and energy.

  2. Measurement

  3. Quantity • Something that can be measured such as… temperature, volume, length, mass.

  4. Measurement • Consists of a number and units. • Examples: 27 ft, 45 liters, 74F.

  5. Standard • An exact quantity that people agree to use for comparison.

  6. SI units • “Le Syste’me Internationale d’ Unite’s” • The standard system of measurement used worldwide.

  7. Dimensional Analysis (Factor-Label Method) • The use of conversion factors and unit-labeled numbers to solve problems.

  8. Conversion Factor • Number used to convert from on unit to another. • Equal to one.

  9. Examples • How many cm are there in 25 m? 25 m 100 cm = 2500 cm 1 m

  10. Examples • How many micrometers is 0.073 cm? 0.073 cm 1 m 1,000,000 m = 730 m 100 cm 1 m

  11. Examples • How many seconds are in one day? 1 day 24 h 60 min 60 s = 86,400 s 1 day 1 h 1 min

  12. Examples • Convert 50 mph to km/s. 50 miles 1.609 km 1 hour = .022 km/s hour 1 mile 3600 s

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