8.1 and 8.2

Si and the metric system

• si units
  • A system that makes conversion easier
  • A base unit (liters, meters, grams)
  • A set of scale factors
    • kilo (k) = base x 1000
    • hecto (h) = base x 100
    • deca (da) = base x 10
    • base = base x 1
    • deci (d) = base x .1
    • centi (c) = base x .01
    • mili (m) = base x .001
  • 1000 milligrams = 1 gram
  • 100 cl = 1 l
  • 10 dm = 1 m
  • 10 m = 1 dam
  • 100 l = 1 hl
  • 1000 m = 1 km
• To convert from one si unit to another
  • The wiggle method.
  • Another method
    • Count the number of steps on the table. (n steps)
    • 10ⁿ smaller = 1 larger
• Do problem 34, 38, 44, 54

Length, Area, Volume

• length a measure in one dimension.
  • meters, kilometers, centimeters
  • 1 yard = 3 ft = 36 inches
• Area a measure in two dimensions.
  • units squared
  • A = l × w
  • A = πr²
• Volume a measure in three dimensions
  • cubic units
  • V = l×w×h
  • V = πr²h
• A word of caution: 1 ft² = x in²

Homework

• Page 475 33 to 70 odd.
• Page 487 99 to 132 odd