1. Conversion Factor:
Length
1 cm = 0.3937 inch ( in)
1 m = 3.2808 feet (ft)
1 m = 100 centimeters (cm)
1 m = 1.0936 yards (yds)
1 km = 0.6214 mile (mi)
Mass
1 g = 0.0353 ounce (oz)
1 kg = 1000 grams (g)
1 kg = 2.2 pounds (lbs)
1 kg = 0.0685 slug
1 ton = 2000 pounds (lbs)
1 lb = 16 ounces (oz)
Derived quantities
- Are quantities whose units arebuilt up from fundamental quantities.
Example:
1. Speed- define as how fast an object is moving.
Speed = distance/time v= d/t( m/s; km/hr)
2. Volume- define as the amount of space a occupies
3. Density- defined as the mass per unit volume.
Density= mass/volume D=m/v (kg/m3
; g/cm3
)
Precision- refers to the closeness of a set of readings to each other.
Accuracy- refers to the closeness of a reading to that of the accepted value.