Lesson 4: What is Mass?

What is Mass?

Definition: Mass is the amount of matter (or stuff) an object has.

Unit of Mass

• The SI unit for Mass is kilogram
• Abbreviated kg
• 1 kg = 1,000 grams
• 1 kg is about the mass of 1 textbook
• 1 g is about the mass of 1 paper clip

Mass is NOT...

• Volume
• How much space an object takes up
• Energy
• Heat
• Light

Mass is NOT Weight!

• Weight has to do with gravity
• Gravity is the force (push or pull), attracting an object towards another object, often the center of Earth

For example: If a ball’s mass is 100kg, it weighs about 220 lbs on Earth. The same ball will weigh about 37 lbs on the Moon. Because the moon’s gravity is ⅙ of Earth’s gravity. The ball’s mass stays the SAME on Earth and the moon, but it’s weight CHANGES.

What is Mass used for?

• Density
• Density= Mass / Volume
• Force
• Force = Mass x Acceleration

• Weight ha

Lesson 3: How to Convert Between Metric Units

METRIC CONVERSIONS: 

How to CONVERT between METRIC UNITS?

6 Easy Steps:

1. Memorize the ORDER of METRIC PREFIXES
2. Identify your GIVEN metric unit.
3. Identify the metric unit being ASKED.
4. Determine the DIRECTION to go from the GIVEN metric unit to the ASKED metric unit.
5. Count the SPACES BETWEEN the GIVEN unit to the ASKED unit.
6. Move decimal SAME NUMBER of SPACES and in the SAME DIRECTION, adding in zero’s.

Step 1: Memorize the ORDER of METRIC PREFIXES

Use this pneumonic (the first letter of each word in the phrase matches the first letter of each metric PREFIX!)

King Henry  Died  By     drinking chocolate milk

kilo  hecto  Deka basic*   deci      centi      milli

* basic=basic unit

Step 2: Identify your GIVEN metric unit.

For example: Convert 892 km into cm.

Your GIVEN metric unit is 892 km because the problem gives you the number (quantity) and the unit.

Step 3: Identify the metric unit being ASKED.

Same example: Convert 892 km into cm.

The metric unit being asked is cm because you are being asked for the number quantity in cm.

Step 4: Determine the DIRECTION to go from the GIVEN metric unit to the ASKED metric unit.

King Henry  Died  By     drinking chocolate milk

kilo  hecto  Deka basic*   deci      centi      milli

* basic=basic unit

GIVEN
    ASKED

Same example: Convert 892 km into cm.

               From   GIVEN  to  ASKED is in the    

                          DIRECTION TO THE RIGHT

Step 5: Count the SPACES BETWEEN the GIVEN unit to the ASKED unit.

King Henry  Died  By     drinking chocolate milk

1 2 3 4 5

kilo  hecto  Deka basic*   deci      centi      milli

GIVEN * basic=basic unit  ASKED

Same example: Convert 892 km into cm.

               From   GIVEN  to  ASKED is 5 SPACES

                          TO THE RIGHT

Step 6: Move decimal SAME NUMBER of SPACES and in the SAME DIRECTION, adding in zero’s.

Same example: Convert 892 km into cm.

             From  GIVEN  to  ASKED is 

5 SPACES TO THE RIGHT

892km=
892.0.0.0.0.0.cm=
1 2 3 4 5
89,200,000.cm

The GIVEN decimal moves 5 SPACES TO THE RIGHT.

Example: Convert 892 km into cm.

Final answer is 89,200,000. cm

Lesson 2: What are Metric Prefixes?

What are METRIC PREFIXES?

What are the Metric UNITS?

Description	Metric Unit	Abbreviation	Picture
Time	seconds	s
Length	meter	m
Mass	gram	g
Temperature	Kelvin	K
Area	meters squared	m2
Volume (Solids)	meters cubed	m3
Volume (Liquids)	Liters	L

What are Metric PREFIXES?

• Metric System is based on powers of 10
• increase a metric unit by multiplying it by a multiple of 10
• multiply by 10
• multiply by 100
• multiply by 1,000
• multiply by 10,000
• • Metric System is based on powers of 10
  • decrease a metric unit by dividing it by a fraction of 10
  • divide by 10
  • divide by 100
  • divide by 1,000
  • divide by 10,000
  • Each increase or decrease by a power of 10 is identified as a prefix
  • kilo is the prefix for multiplying a metric unit by 1,000 times

  • example: 1 kilogram=1,000 grams

    kilo is abbreviated as just a k

     example: 1 kg= 1 kilogram
  • hecto is the prefix for multiplying a metric unit by 100 times
  • example: 1 hectometer= 100 meters
  • hecto is abbreviated as just a h
  • example: 1 hg=1 hectogram
  • Deka is the prefix for multiplying by 10
  • example: 1 Dekameter= 10 meters
  • deka is abbreviated as just a da
  • example: 1 dag= 1 dekagram
  • deci is the prefix for dividing a metric unit by 10 times
  • example: 1 decimeter= 1/10 meter or 0.1 meter
  • deci is abbreviated as just a d
  • example: 1 dg=1 decigram
  • • centi is the prefix for dividing a metric unit by 100 times
    • example: 1 centigram=1/100 of a gram or .01grams
    • centi is abbreviated as just a c
    • example: 1 cg= 1 centigram
    • milli is the prefix for dividing a metric unit by 1000 times
    • example: 1 millimeter= 1/1000 of a meter or .001 meters
    • milli is abbreviated as just a m
    • example: 1 mg=1 milligram
    What is the BASIC UNIT?
  • • Basic Unit is any METRIC UNIT multiplied by 1
    • Examples are: 1 meter, 1 gram, 1 second, etc

    
    
    

    To Summarize...

  • metric prefix	kilo	hecto	Deka	Basic Unit
    multiply by	1,000	100	10	1
    example	km	hm	dam	meter (m)

  • 
    

    metric prefix	Basic Unit	deci	centi	milli
    divide by	1	10	100	1000
    example	meter (m)	dm	cm	mm

    
    
    Memorize the METRIC PREFIXES!
    Use this pneumonic (the first letter of each word in the phrase matches the first letter of each metric PREFIX!)
    
    King Henry  Died  By     drinking chocolate milk
      
    
    kilo  hecto  Deka basic*   deci      centi      milli
    * basic=basic unit