review from yesterday what is the scientific method? what are the steps of the scientific method?...
TRANSCRIPT
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Review from Yesterday
• What is the Scientific Method?
• What are the steps of the scientific method?
• Define hypothesis.
• Why do scientists communicate their results?
• Do you perform a method of solving problems?
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Section 3Measurement
• Key Concepts• Why is scientific notation useful?• What units do scientists use for their
measurements?• How does the precision of measurements affect
the precision of scientific calculations?
• The Metric System
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Measurements
• The oldest known record of measurements is about 10,000 yrs. old (found in Africa)
• Because not many humans were able to measure, they all used the same system.
• When everyone agrees to the same units it is called Standard Units
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The International System of Units (SI system)
• Developed in France in 1799
• has units for all types of quantities
• unit is written after the number
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The International System of Units (SI system)
• Weight = 125
• What? pounds, Newton's, zebras
• MUST include UNITS to make it more understandable.
• 125 pounds
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The International System of Units (SI system)
• SI system works by combining prefixes and base units.
• Each base unit can be used with different prefixes to define larger or smaller quantities.
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The International System of Units (SI system)
Prefixes
Kilo Hecto Deca Base unit Deci Centi Milli1000x 100x 10x 0 0.1x 0.01x 0.001xKids Have Dropped Over Dead Converting Metrics
Meter orLiter orGram
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Measuring Quantities in SIBase Units
• Length
• Volume
• Mass
• Temperature
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Length
• Length (distances) are measured in Meters (m)
• Meter stick is equal to 1 meter
• Units are created by attaching prefixes
• 1 Kilometer, 1 millimeter, 1 centimeter 1000 m .001m .01m
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Volume
• Is how much space an object takes up
• Measured in Liters (L)
• 2 ways to find volume Mathematical – Length x Width x Height Displacement – Demonstrate using graduated cylinder
• KL, mL, L
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Mass
• Is the measure of the amount of matter in an object
• Measured in Grams (g)
• Mass is NOT WEIGHT
• Use a balance to find mass
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Temperature
• degrees Celsius (oC) is used to measure temperature
• A thermometer is used
• Water freezes at 0 oC and boils at 100 oC
• There is no prefix used for temperature
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How do you convert in the Metric System?
• How many millimeters are there in 2.5 Kilometers?
1st – set up the prefixes
Kilo Hecto Deca O Deci Centi Milli
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How do you convert in the Metric System?
• 2nd – set up what you have to convert
Kilometers to millimeters
• 3rd – Look at your prefixes again
Kilo Hecto Deca O Deci Centi Milli
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How do you convert in the Metric System?
• 4th – count how many spaces separate the two prefixes
Kilo Hecto Deca O Deci Centi Milli
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How do you convert in the Metric System?
• 4th – count how many spaces separate the two prefixes
Kilo Hecto Deca O Deci Centi Milli
1
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How do you convert in the Metric System?
• 4th – count how many spaces separate the two prefixes
Kilo Hecto Deca O Deci Centi Milli
2
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How do you convert in the Metric System?
• 4th – count how many spaces separate the two prefixes
Kilo Hecto Deca O Deci Centi Milli
3
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How do you convert in the Metric System?
• 4th – count how many spaces separate the two prefixes
Kilo Hecto Deca O Deci Centi Milli
4
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How do you convert in the Metric System?
• 4th – count how many spaces separate the two prefixes
Kilo Hecto Deca O Deci Centi Milli
5
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How do you convert in the Metric System?
• 4th – count how many spaces separate the two prefixes
Kilo Hecto Deca O Deci Centi Milli
6
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How do you convert in the Metric System?
• 5th – move the decimal the same amount of spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces • 2.5 km
2.5
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How do you convert in the Metric System?
• 5th – move the decimal the same amount of spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces • 2.5 km
25.
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How do you convert in the Metric System?
• 5th – move the decimal the same amount of spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces • 2.5 km
250.
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How do you convert in the Metric System?
• 5th – move the decimal the same amount of spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces • 2.5 km
2500.
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How do you convert in the Metric System?
• 5th – move the decimal the same amount of spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces • 2.5 km
25000.
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How do you convert in the Metric System?
• 5th – move the decimal the same amount of spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces • 2.5 km
250000.
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How do you convert in the Metric System?
• 5th – move the decimal the same amount of spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces • 2.5 km
2500000.
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How do you convert in the Metric System?
• 5th – move the decimal the same amount of spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces • 2.5 km =
2500000. mm
2.5 km = 2,500,000 mm
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How do you convert in the Metric System?
• How many grams are there in 450 centigrams?
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In-Class Work
• 25 L = __________ mL
• 20 mg = _________cg
• 120 m = ___________km
• 567 cm = __________mm
• 45 kL =___________L
• 0.003 km = ________ cm
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Homework
• Metrics Worksheet