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Regents Physics

9/12/2012

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OBJECTIVE: SWBAT convert between units with different prefixes.

Do Now:

A yard is a little less than a meter long (1 yard = 0.91m). Estimate the height of your table in yards and then convert that quantity in terms of m or km.

One inch is about 2.5cm long. Estimate the length of your pencil in centimeters.

Given there are 100cm in 1m. How many meters are there in 80 cm? 

+Agenda

Becoming familiar with metric units: What does a m, L, g look like?

Convert between units with different prefixes

+English to Metric System

What is something that is about: 1m long?

+Basic Units• Distance: meters (m)• Mass: grams (g)• Volume: liters (L)

+Mnemonic

King -- Kilo

Henry -- Hexa

Died -- Deca

Unexpectedly – Base unit

Drinking -- deci

Chocolate -- centi

Milk – milli

(micro)

+SI PrefixesYou move the decimal place when you are converting between units with different prefixes

km1000

Hm100

decm10

m1

dm0.1

cm0.01

mm0.001

s

+Example

Convert 70mm into meters.

Identify the quantity measured. What is the base unit?

Is a millimeter smaller or bigger than a meter?

How much smaller/bigger is a mm compared to a m?

km1000

hm100

decm10

m1

dm0.1

cm0.01

mm0.001

s

+How to convert between units?

1000mm in 1 meter

Conversion factor is 1000: 1000mm/m or 1m/1000mm

Would I divide or multiply the number by its conversion factor?

Moving LEFT (to larger units) DIVIDE by the conversion factor.

Moving RIGHT (to smaller units) MULTIPLY by the conversion factor.

km1000

hm100

decm10

m1

dm0.1

cm0.01

mm0.001

0 0 0

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70mm

mm are smaller than m, so 70mm will be a fraction of a meter!1000mm in 1 m!

÷(1000mm/m) = 0.07m

km1000

hm100

decm10

m1

dm0.1

cm0.01

mm0.001

0 0 0

+Group work

Convert 22L into mL.

Is a L smaller or bigger than a mL?

How much smaller/bigger is a L compared to a mL? What is the conversion factor?

kL1000

hL100

decL10

L1

dL0.1

cL0.01

mL0.001

+Worksheet: Metrics and Prefixes

Directions: For each group of values listed below, write the items in order from largest to smallest. Then state whether the values represent distance, mass, or volume.

+Exit Slip

Directions: Close your binder/notebook and clear your table. Answer the questions on a sheet of paper. This activity is to be completed independently.

Questions:

1. Convert 54kg to grams (g).

2. Convert 458cm to meters (m).