# Drill Use the metric prefixes to define these

• Slides: 8

Drill: Use the metric prefixes to define these terms WHAT IS THE DEFINITION OF … A. Millisecond =10 -3 seconds B. Kilogram =103 grams C. Megawatt =106 Watts D. Nanometer =109 meters IOT I 1 -08 POLY ENGINEERING

Base Units 7 FUNDAMENTAL SI UNITS: 1. LENGTH - meter 2. MASS - kilogram 3. TIME - second 4. ELECTRIC CURRENT - ampere 5. THERMODYNAMIC TEMPERATURE - Kelvin 6. AMOUNT OF MATTER - mole 7. LUMINOUS INTENSITY - candela IOT I 1 -08 POLY ENGINEERING

Derived Units • Base units can be multiplied or divided to create derived units • Examples – Area = Length*Width • Has units of Length 2(ex ft 2, m 2) – Volume = Length * Width * Height • Has units of Length 3 (ex. ft 3, m 3) – Speed = Distance/Time • Has units of Length/Time (ex. mph, m/s) IOT I 1 -08 POLY ENGINEERING

Derived Units • Units can be converted between different types of units • Ex. Convert 2 feet into inches. – Use conversion factor (1 ft = 12 in) – Set up ratios to multiply factors IOT I 1 -08 POLY ENGINEERING

Derived Units • Ex: Convert 3 miles into inches – 1 ft = 12 inches – 1 mile = 5280 ft • Ex: Convert 3 kilometers to centimeters – 1 km = 1000 m – 1 cm = 0. 01 m IOT I 1 -08 POLY ENGINEERING

Derived Units • Ex: Convert 55 miles/hr into m/s – – – 1 mile = 5280 ft 1 ft = 12 inches 1 inch = 2. 54 cm 1 cm = 0. 01 m 1 hr = 60 min 1 min = 60 s IOT I 1 -08 POLY ENGINEERING

Classwork • With a partner convert the following – 5 lbs into kg (1 kg = 2. 2 lb) – Convert 10 mph into m/s – Convert 2 miles into kilometer IOT I 1 -08 POLY ENGINEERING

Homework 1. Convert 3 miles into feet 1. 1 mile = 5280 feet 2. Convert 4 km into mm 1. 1 km = 1000 m 2. 1 mm = 0. 0001 m 3. Convert 20 feet into meters 1. 1 ft = 12 in 2. 1 in = 2. 54 cm 3. 1 cm = 0. 01 m IOT I 1 -08 POLY ENGINEERING