C ATALYST 1. Set up yourCornell notes by: a) Putting the heading (metrics) at the top left b) Gluing the notes on the right side. 2. Answer the catalyst questions on your notes 3. Turn in your SCIENTIST picture.

OBJECTIVES SWBAT: -explain why we need the metric system - distinguish between metric units - understand why we need different sized units

E NGLISH S YSTEM You are familiar with inches, feet, miles, pounds, quarts, and so on. This is not an easy system! How many inches in 1 foot? 12 inches How many feet in a yard? 3 feet How many yards in a mile? 1760 yards

M ETRIC S YSTEM Metric system is decimalized, meaning it has a base of 10 This means that each unit is 10 times bigger or smaller than the next. This makes it much easier!

W HY DO WE USE THE M ETRIC S YSTEM ? We use the metric system because we can easily manipulate metric units into more useful sizes and measures. We start with a base unit and manipulate it to make smaller or bigger

M ETRIC S YSTEM Another goal of the metric system is to have a single unit for any physical quantity across the world. This allows scientists to communicate in a standard mathematical language regardless of where they come from!

Metric System – Base Units Base quantity Unit Name Symbol Lengthmeterm Massgramg Timeseconds Liquid Volumeliterl Pay attention to the symbols!

B ASE U NITS Meter  length Length of a table Height of a person Gram  mass Mass of a pencil Mass of a calculator

B ASE U NITS Seconds  time Time for a pencil to fall to the ground Liters  liquid volume Amount of liquid in a monster can Amount of water in a cup

M ETRIC P REFIXES In the English system, there are inches, feet, yards, and miles to measure length In the metric system, we add prefixes to our base units to create larger and smaller units Prefix- placed at the beginning

M ETRIC P REFIXES PREFIXSYMBOL Kilo-k- Hecta-H- Deca-D- Base Unitm, l, s, g Deci-d- Centi-c- Milli-m- Units get smaller Units get larger

M ETRIC P REFIXES PREFIXSYMBOL K ingKilo-k- H enryHecta-H- D oesDeca-D- Base Unitm, l, s, g D rinkDeci-d- C hocolateCenti-c- M ilkMilli-m- Mnemonic Device – will help us remember the metric prefixes

P REFIXES + B ASE U NITS To create smaller or larger units we combine the prefixes with the base units Kilo (k) + meter (m) = kilometer (km) Kilo (k) + gram (g) = kilogram (kg)

P REFIXES + B ASE U NITS To create smaller or larger units we combine the prefixes with the base units Kilo (k) + meter (m) = kilometer (km) Kilo (k) + gram (g) = kilogram (kg) Centi (c) + liter (l) =

P REFIXES + B ASE U NITS To create smaller or larger units we combine the prefixes with the base units Kilo (k) + meter (m) = kilometer (km) Kilo (k) + gram (g) = kilogram (kg) Centi (c) + liter (l) = centiliter (cl) Milli (m) + second (s) =

P REFIXES + B ASE U NITS To create smaller or larger units we combine the prefixes with the base units Kilo (k) + meter (m) = kilometer (km) Kilo (k) + gram (g) = kilogram (kg) Centi (c) + liter (l) = centiliter (cl) Milli (m) + second (s) = millisecond (ms) Milli (m) + meter (m) =

P REFIXES + B ASE U NITS To create smaller or larger units we combine the prefixes with the base units Kilo (k) + meter (m) = kilometer (km) Kilo (k) + gram (g) = kilogram (kg) Centi (c) + liter (l) = centiliter (cl) Milli (m) + second (s) = millisecond (ms) Milli (m) + meter (m) = millimeter (mm)

P REFIXES + B ASE U NITS Now you try Hecta (H) + meter (m) = deci (d) + gram (g) = Centi (c) + meter(m) = Deca(D) + second (s) = Kilo (k) + liter (l) =

P REFIXES + B ASE U NITS Now you try Hecta (H) + meter (m) = Hectameter (Hm) deci (d) + gram (g) = decigram (dg) Centi (c) + meter(m) = centimeter (cm) Deca(D) + second (s) = Decasecond (Ds) Kilo (k) + liter (l) = kiloliter (kl)

HOW BIG ARE THE PREFIXED UNITS? Kilometers - distances between cities Meters – height of people Millimeters – length of ants. Kilograms – mass of people Grams – mass of drops of water Milligrams – mass of medicinal tablets

S UMMARY /Q UESTIONS 1. What is the metric system? 2. What are metric units? 3. What are metric prefixes? Take 4 minutes to write your summary for today and then questions and headings on the left side of the notes

REMINDERS Homework packet #1 due Friday! Quiz 1 on Friday Get a science fair notebook by Wednesday