MEASUREMENT

TYPES QUALITATIVE –RESULTS ARE DESCRIPTIVE (NONNUMERIC: BIG, SMALL, PINCH, ETC.)

QUANTITATIVE –RESULTS ARE NUMERIC WITH UNITS (1 INCH, 5 POUNDS, ETC)

SI(FUNDAMENTAL)UNI TS 1) LENGTH = METER (m) 2) MASS = KILOGRAM (kg) 3) TIME = SECOND (s) 4) TEMPERATURE = KELVIN (K)

5) AMOUNT OF SUBSTANCE = MOLE (mol) 6) PRESSURE = PASCAL (pa) 7) ENERGY = JOULE (J)

DERIVED UNITS DEFINED IN TERMS OF 2 OR MORE SI UNITS DEFINED IN TERMS OF 2 OR MORE SI UNITS REQUIRES MATH (CALCULATED VALUE) REQUIRES MATH (CALCULATED VALUE) EXAMPLES: EXAMPLES:

1) VOLUME VOLUME = L x W x H = LENGTH UNIT 3 VOLUME = L x W x H = LENGTH UNIT 3 UNITS: cm 3 (mL), dm 3 (L), etc. UNITS: cm 3 (mL), dm 3 (L), etc.

2) SPEED SPEED = DISTANCE/TIME SPEED = DISTANCE/TIME UNITS: m/s, km/s, km/hr, etc. UNITS: m/s, km/s, km/hr, etc.

3) DENSITY DENSITY = MASS/VOLUME DENSITY = MASS/VOLUME UNITS: kg/cm 3, g/cm 3, g/mL UNITS: kg/cm 3, g/cm 3, g/mL

PHYSICAL PROPERTY USED FOR IDENTIFICATION DOES NOT DEPEND ON HOW MUCH MATERIAL YOU USE EX: DENSITY OF 1.00 kg OF SILVER = DENSITY OF 1.00 g OF SILVER

PRACTICE PROBLEMS COPY & SHOW ALL WORK. DON’T FORGET UNITS. 1) WHAT IS THE DENSITY OF AN OBJECT WITH A MASS OF 73.7 g AND A VOLUME OF 5.34 cm 3 ? 2) WHAT IS THE VOLUME OF A CUBE THAT IS 7.3 m ON A SIDE?

3) WHAT SPEED IS AN OBJECT TRAVELING AT TO GO 4.0m IN 0.045s?