Unit Conversions. A physical quantity must include: Number + Unit.

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Presentation transcript:

Unit Conversions

A physical quantity must include: Number + Unit

Calculation Corner: Unit Conversion 1 foot 12 inches 1 foot “Conversion factors”

Calculation Corner: Unit Conversion 1 foot 12 inches 1 foot “Conversion factors” = 36 inches ( ( 12 inches 1 foot ) ) 3 feet ( ( ) )

How many cm are in 1.32 meters? applicable conversion factors: equality: or 1.32 m= 1 m = 100 cm ______1 m 100 cm We use the idea of unit cancellation to decide upon which one of the two conversion factors we choose. ______ 1 m 100 cm () ______ 1 m 100 cm 132 cm (or 0.01 m = 1 cm)

How many meters is 8.72 cm? applicable conversion factors: equality: or 8.72 cm= 1 m = 100 cm ______1 m 100 cm Again, the units must cancel. ______ 1 m 100 cm () ______ m 1 m 100 cm

How many feet is inches? applicable conversion factors: equality: or in= 1 ft = 12 in ______1 ft 12 in Again, the units must cancel. () ____ 3.28 ft 1 ft 12 in ______ 1 ft 12 in

How many miles are in 5 km? applicable conversion factors: equality: or 5 km= 1 mile = 1.6 km ______1 mile 1.6 km Again, the units must cancel. ______ 1 mile 1.6 km () ______ 3.13 miles 1 mile 1.6 km