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Do Now. Complete the handout you picked up from the front door. Put HW to be checked on desk. Put tonight’s HW in HW folder. Write tonight’s HW in your agenda. Get out your ruler and binder to take notes. Metric System. Unit 1 Day 3 Greeter : Read today’s objectives. DID YOU KNOW.

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do now
Do Now
  • Complete the handout you picked up from the front door.
  • Put HW to be checked on desk.
  • Put tonight’s HW in HW folder.
  • Write tonight’s HW in your agenda.
  • Get out your ruler and binder to take notes.
metric system

Metric System

Unit 1 Day 3

Greeter: Read today’s objectives

slide3
DID YOU KNOW

It’s a metric world

The united states is the only western country not presently using the metric system as its primary system of measurement. The only other countries in the world not using metric system as their primary system of measurement are Yemen, Brunei, and a few small islands; see

Fig. 8.15.

slide4
DID YOU KNOW

In 1906, there was a major effort to convert to the metric system in the United States, but it was opposed by big business and the attempt failed.

The Trade Act of 1988 and other legislation declare the metric system the preferred system of weights and measures of the U.S. trade and commerce, call for the federal government to adopt metric specifications, and mandate the Commerce Department to oversee the program. The conversion is currently under way; however, the metric system has not become the system of choice for most Americans’ daily use.

slide5
DID YOU KNOW

Lost in space

In September 1999, the United States lost the Mars Climate Orbiteras it approached Mars. The loss of the $125 million spacecraft was due to scientists confusing English units and metric units.

Two spacecraft teams, one at NASA’s Jet Propulsion Lab (JPL) in Pasadena, CA, and the other at a Lockheed Martin facility in Colorado, where the spacecraft was built, were unknowingly exchanging some vital information in different units.

The missing Mars Climate Orbiter

slide6
American vs. Metric Length

American standard

1 mile = 1760 yards

= (5280 feet)

1 yard = 3 feet

1 foot = 12 inches

1 mil = 1/1,000 inch

Metric standard

1 kilometer = 1000 meters

1 meter = 10 decimeters

1 decimeter = 10 centimeters

( 1 meter = 100 centimeters)

1 centimeter = 10 millimeters

Conversion:

1 inch is defined to be exactly 2.54 cm in July, 1959.

metric system1
Metric System
  • The metric system is based on a base unit that corresponds to a certain kind of measurement
      • Length = meter
      • Volume = liter
      • Weight (Mass) = gram
      • Temperature = celsius
metric system2
Metric System
  • The units of the metric system are made up of prefixes and base units.
    • Example: centi + meter = centimeter
    • Example: kilo + gram = kilogram

Prefix

Base Unit

how to remember different lengths in the metric system
How to remember different lengths in the metric system:
  • When you think of a millimeter (mm) think of:
    • The thickness of a dime.
  • When you think of a centimeter (cm) think of:
    • The width of your pinky.
how to remember different lengths in the metric system1
How to remember different lengths in the metric system:
  • When you think of a meter (m) think of:
    • The height of the doorknob.
  • When you think of a kilometer (km) think of:
    • A little more than half of a mile
metric system3
Metric System
  • The three prefixes that we will use the most are:
    • kilo
    • centi
    • milli
how can you remember these
How can you remember these???
  • King Henry Died by Drinking Chocolate Milk
    • King: Kilo
    • Henry: Hecto
    • Died: Deca
    • By: Base (m, L, g)
    • Drinking: Deci
    • Chocolate: Centi
    • Milk: Milli
metric system4
Metric System
  • Centimeters are 10 times larger than millimeters so it takes more millimeters for the same length

1 centimeter = 10 millimeters

Example not to scale

40

41

40

41

1 cm

metric system5
Metric System
  • An easy way to move within the metric system is by moving the decimal point one place for each “step” desired

Example: change meters to centimeters

1 meter = 10 decimeters = 100 centimeters

or

1.00 meter = 10.0 decimeters = 100. centimeters

metric system6
Metric System
  • Now let’s try our previous example from meters to kilometers:

16093 meters = 1609.3 decameters = 160.93 hectometers = 16.093 kilometers

  • So for every “step” from the base unit to kilo, we moved the decimal 1 place to the left (the same direction as in the diagram below)
metric system7
Metric System
  • If you move to the leftin the diagram, move the decimal to the left
  • If you move to the rightin the diagram, move the decimal to the right
practice problems
Practice Problems
  • 4 km = ______ m
  • 7 m = ______ cm
  • 20 cm = _______ mm
  • 80 mm = ______ cm
  • 910 cm = ______ m
  • 73000 m = _______ km
practice problems1
Practice Problems
  • 4.000 km = 4000 m
  • 7.00 m = 700 cm
  • 20.0 cm = 200 mm
  • 80 mm = 8.0 cm
  • 910 cm = 9.10 m
  • 73000 m = 7.3000 km
metric system8
Metric System
  • Summary
    • Base units in the metric system are meter, liter, gram
    • Metric system is based on powers of 10
    • For conversions within the metric system, each “step” is 1 decimal place to the right or left
    • Using the diagram below, converting to the right, moves the decimal to the right and vice versa
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