Factor Label Method Dimensional Analysis

OBJECTIVES Precision VS Accuracy Rounding Numbers Significant Figures Scientific Notation Metric Conversions Factor Label Method Temperature Conversions

SI Prefixes Multiple Prefix Symbol 106 mega M 103 kilo k 10-1 deci D 10-2 centi C 10-3 milli m 10-6 micro 10-9 nano n 10-12 pico p 2

Relationships of Some U.S. and Metric Units Length Mass Volume 1 in = 2.54 cm 1 lb = 0.4536 kg 1 qt = 0.9464 L 1 yd = 0.9144 m 1 lb = 16 oz 4 qt = 1 gal 1 mi = 1.609 km 1 oz = 28.35 g 1 mi = 5280 ft 1 L = 1.06 qt 1 lb = 454 g 2

One Step Conversions

Feet to Inches So using that set up how many inches in 3 feet? Hours in a day? Feet in a mile?

Multiple Step Conversions

Factor Label Method How many Years have you been alive? Days? Seconds?

Units: Dimensional Analysis The ratio (3 feet/1 yard) is called a conversion factor. 2

TIPS 1. Start simple. 2. Write units with your numbers ALWAYS! 3. Go step by step. 4. Check your conversion factors. 5. Pinpoint what the question is asking 6. Is your answer logical? 7. Practice, practice, practice.

Worksheet VIDEO Video