8-21-18

Objective: Understand SI Units, the design of the metric system, and proper resolution in measurement

1. Notebook Check + Syllabus Check

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• Notes – SI Units and Metric System

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“Science is a body of knowledge and a process of gaining new knowledge”

What is Science?

Slide # 1

How do we obtain this knowledge?

By making observations

and collecting data

Slide # 2

What is Data?

• Data is information that is gathered from which analysis and conclusions can be made.

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• Smell Size
• Touch/feel Length
• Hear Time
• Area Mass
• Speed Volume
• Distance Temperature
• What you can see – color, data given

Slide # 3

Collect Some data about these pictures

Picture # 1

Picture # 2

Qualitative data

(observations without numbers)

Quantitive data (numbers)

In this class we will be collecting quantitative data to make conclusions

Slide # 4

Measurement

What is measurement?

Why is it important?

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A determination of something that typically has a number value and a unit that typically tells you what that number value means

30 feet

Measurement is the tool used by science. It is like music notes to a musician or clues to a detective, scientists use measurement.

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Slide # 5

Units are important

Slide # 6

Measure

• Measure – Measurements describe the amount of something.
• Measurements include both a Number and a Unit.

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Scientists measurements include:

Length

Mass

Area

Volume

Temperature

Time

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• Example: The car is 5 meters in length and weighs 2,500 kg.

Slide # 7

Measurement�

SI Units

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Meter (m)

Gram (g)

m²

Liter (L)

Celsius (c)

Seconds

English Units

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inches, feet, miles

ounces, pounds, tons

square feet

Teaspoon, Gallons, Cups

Degrees Fahrenheit (f)

Seconds, Minutes, Hours

Type

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Length

weight/ mass

Area

Volume

Temperature

Time

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​

​

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Slide # 8

Standard International Units

Self Quiz�Can you recall the SI units?

• SI - Systems International Units or Metric Units

Base Units of measure.

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Meter

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m

gram

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g

Square meter

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m²

Liter

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​

L

Celsius

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​

^oC

Second

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​

s

Slide # 9

Why is the metric system the � Standard International (SI) unit?

• English System

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• 12 inches = 1 foot
• 5,280 feet = 1 mile
• 16 oz = 1 pound
• 2,000 pounds = 1 ton
• 4 quarts to one gallon

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• Metric System

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• 10mm = __________
• 100cm = __________
• 1,000 m = _________
• 1,000g = __________
• 1,000ml = _________

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Are there any patterns here?

Are there any patterns here?

None

Yes! based on powers of 10

Slide # 10

1cm

1m

1km

1kg

1L

Base SI Units

Prefix

Symbol

Factor

These three (3) are the most important ones to know

Slide # 11

props

https://www.newsweek.com/fox-tucker-carlson-attacks-metric-system-1442485

Metric prefixes

• Prefixes are added to the names of basic SI units such as meter, liter and gram.
• Prefixes describe very small or large measurements.

Slide # 11

Metric Bar

Base

kilo

1,000

milli

centi

100

10

0

0.1

0.01

0.001

deci

hecto

deca

Slide # 12

Prefix

No Prefix

The three (3) in red are the most important ones to know

Remember the prefixes with the following acronym:

• King H’enry Died By DrinkingChocolate Milk

Metric System

1) If I have a kilogram of food how many grams is that?

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2) If I have 1 milligram of water how many grams is that?

3) How many centimeters are in one meter?

4) How many meters are

in one kilometer?

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5) How many bytes are in

a megabyte?

Kilo = 1,000

1,000 grams = 1kg

milli = 1/1,000

1mg = 1/1000 grams

centi = 1/100

1cm = 1/100 m

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kilo = 1,000

1,000 grams in one kg

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mega = 1,000,000 (million)

1 million bytes = 1 mb

Slide # 13

1.2 Time and Distance

• Two ways to think about time:
• What time is it?
• How much time (quantity)?

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• A quantity of time is also called a time interval.

Slide # 18

(moment)

1.2 Time

• Time comes in mixed units.
• Seconds are very short.
• For calculations, you may need to convert hours and minutes into seconds.

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How many seconds is this time interval?

Slide # 19

2hrs x 60 min x 60 s = 7200s

1 hr 1 min

30 min x 60 sec = 1800s

min

45 s

9,045 seconds

Time Questions

• Which is the correct SI unit for time (5 min 30 seconds or 330 seconds) _________________
•  
• Time intervals, such as on a stop watch (as seen below), describes a (quantity or moment) ___________ of time.
•  
•  

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Slide # 20

Example, a man ran around the track in 54 seconds

Moment in time (10:09pm)

Quantity

54 seconds

Meter Stick

The meter stick

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A meter stick is 1

meter long and is divided into

millimeters and

centimeters.

Slide # 15

Using your Meter Stick

Measure the following:

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1. Length of your desk top

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• Length of three floor tiles

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• Height of the lab table

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• Length and width of your desk top (area)

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5) Measure the length of the teachers desk

Write Answers on the board

Using your Meter Stick

Measure the following:

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1. Length of your desk top

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• Length of three floor tiles

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• Height of the lab table

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• Length and width a floor tile

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5) Measure the length of the teachers desk

91.8cm

30.5 cm

91.4cm

2.438M

60.8cm

Resolution = the smallest interval that can be measured

Remember the prefixes with the following acronym:

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• King Hector’s Daughter Bakes Delicious

Chocolate Muffins

• Try making up your own acronym!

Let’s use the Metric Rule with our data obtained today

Using your Meter Stick

Measure the following:

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1. Length of your desk top

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• Length of three floor tiles

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• Height of the lab table

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• Length and width a floor tile

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5) Measure the length of the teachers desk

91.8cm change to decameters

30.5 cm change to meters

91.4cm change to meters

243.8cm change to kilometers

60.8cm change to millimeters

Resolution = the smallest interval that can be measured

608 mm

0.914 m

0.0918 dm

.305 m

0.002438 km

����Quiz Friday��SI Units�Metric Prefixes���The End